--- product_id: 11468054 title: "DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300" brand: "dewstop" price: "COP 12863" currency: COP in_stock: false reviews_count: 13 url: https://www.desertcart.co/products/11468054-dewstop-humidity-sensor-switch-for-bathroom-fan-condensation-control-adjustable store_origin: CO region: Colombia --- # DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300 **Brand:** dewstop **Price:** COP 12863 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300 by dewstop - **How much does it cost?** COP 12863 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/11468054-dewstop-humidity-sensor-switch-for-bathroom-fan-condensation-control-adjustable) ## Best For - dewstop enthusiasts ## Why This Product - Trusted dewstop brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description AUTOMATIC CONDENSATION CONTROL — WORKS WHILE YOU FORGET: DewStop's patent-pending QUE™ Technology continuously monitors your bathroom for condensation. When moisture reaches the dew point and attaches to surfaces (mirrors, walls), the switch automatically turns your exhaust fan ON — then shuts it OFF when the room is dry. No manual operation needed. Review: No more reminding guests to turn on the exhaust fan - Update, late summer of 2019: The weather has been cooling off and we have been turning off the AC more often and opening the house for fresh air. The downside of this is that you can't control the humidity of fresh air and my Dewstop switches have been running quite a bit despite turning the humidity sensitivity all the way down. They sense the humidity coming in the window with the fresh air and activate. I finally contacted the company and was very pleased to receive a quick reply that the switches are designed to allow me to turn off the automatic sensing of humidity so that the switch acts like a regular, dumb, on/off switch. The procedure is, make sure the switch is off (no blue light), hold the main on/off button in for at least 15 sec. (The fan will come on when you let go, but just turn it back off, ignore that) This causes the switch to change modes. If the switch was automatically sensing humidity, it stops doing that. If it was in manual mode, holding the button will cause it to switch back to automatic sensing. This is the perfect solution to the problem. During this time of year, because I know I'll have open windows for awhile and plenty of fresh air ventilation in the house, I've set all my switches to manual mode. I can still turn on the fan with a push of the button, it just won't turn on by itself. When winter comes and I close up the house again, I'll revert them all to automatic mode. Well done Dewstop. Update summer of 2019: We are family that likes fresh air when the outside temps are comfortable. Unfortunately, this also means higher humidity levels inside the house. I knew I would have to adjust the switches for "summer mode" and this is my experience. Again, if you're a household that keeps the AC/Heat on year round with the house closed up, this probably won't be an issue for you. As the them outside temps come up and we start opening up the house more, humidity from the outside migrates inside. The switch doesn't know where the humidity comes from, just that its there and so the switch comes on. I turned the sensitivity all the way down, and the switches still come on. I looked in the troubleshooting guide and it talks about the electrical box enclosure. Basically, the box within which the switch is installed, has openings that allow air from inside the wall. This means that overnight, when the house cools down, the inside of the wall cools down also, and during the day when you open the windows and allow warmer air into the room, the switch is potentially feeling air that is slightly cooler inside the wall. The guide says to power down, remove the switches, and seal all openings in the box. However, that just means its now a seal box that is still not breathing to the room within which it is installed. I tested this idea by removing the cover plate so the box is open to the room, in less than an hour, the box had conditioned itself to the room temp and the switch stopped running constantly. So...not sure how to fix that problem. Light switch covers are not design to allow the box to breath from the room, and I'm not convinced that sealing the elec box with solve the problem. Bottom line, if you're purchasing this switch, recommend before installing it, that you seal the elec box first. If it does work, it will save you from having to do it later. So far, works perfectly. Comes on when condensation starts to form and doesn't shut off until the humidity is back under control. I read the negative reviews, and I can see how people might have difficulty with this product. Its sensitivity and automation will be affected by the static humidity in the house, which varies. I have electric heat, which is very dry. My current static humidity is around 45 percent. In the summer with the AC running, my humidity is in the 60s so I assume that I will have to adjust the sensitivity of the switch for summer. If we decide to turn off the AC and open the windows for fresh air, the humidity can get really high and if I don't adjust the switch for that, it will be kicking on often. Bottom line, the switch works great, you have to know the humidity in your home and adjust the switch to compensate for it. I ordered this one as a test, but am so happy with it, I'll be ordering more for the other bathrooms. Review: Bathroom Exhaust Fan Intelligent Control - The control device is easy to install for those of us who are experienced in replacing wall switches and outlets. And imagine this: It works as described! When the humidity rises, such as after a shower, it runs the exhaust fan until the humidity drops to normal value. The setting for humidity control is adjustable, so if the default value isn't right for you, you can adjust it accordingly. The unit also has a nice push button which activates the fan for 30 minutes. So, say goodbye to the occasions of the fan being left running for hours and hours, or the instances of the fan being needed but was not used. The push button also serves to stop the fan while running if you wish. Overall, this is a very satisfying product because it works so well. ## Features - ADJUSTABLE HUMIDITY SENSITIVITY — FITS ANY BATHROOM: Set the sensor to Low, Average, or High sensitivity to match your specific bathroom conditions. Ideal for very dry climates (higher sensitivity) or very humid environments (lower sensitivity). Sensitivity can be disabled to use as a manual timer-only switch at any time ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00NODI9VM | | Batteries required | No | | Customer Reviews | 4.0 4.0 out of 5 stars (200) | | Finish types | Powder Coated | | Is Discontinued By Manufacturer | No | | Item Weight | 5 ounces | | Item model number | FS-300-W1 | | Manufacturer | GTR Technologies, Inc | | Product Dimensions | 2 x 3 x 4.75 inches | ## Images ![DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300 - Image 1](https://m.media-amazon.com/images/I/71hClQJUVaL.jpg) ![DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300 - Image 2](https://m.media-amazon.com/images/I/61UPOk4lbOL.jpg) ![DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300 - Image 3](https://m.media-amazon.com/images/I/51TNHkuOmQL.jpg) ![DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300 - Image 4](https://m.media-amazon.com/images/I/41wrr-+abKL.jpg) ![DewStop Humidity Sensor Switch for Bathroom Fan, Condensation Control with Adjustable Sensor & Countdown Timer, Automatic Fan On/Off, White, FS-300 - Image 5](https://m.media-amazon.com/images/I/51PpxvQ5cpL.jpg) ## Questions & Answers **Q: Will this unit fit into a regular gfci footprint? i am replacing a fan control in a "2 gang" box so will need a different faceplate.** A: I currently have mine installed in a dual switch box along side a motion sensor for my bathroom light. my dew senor replaced the switch for the fan and the motion sensor replaced the switch for the light; both in the same switch box. both fitted very nicely with enough "wiggle room." **Q: Does it work on 220V/50HZ mains?** A: No **Q: My wall switch is too far from shower. Can this sensor/switch be used closer to the shower in a 3-way switch type fashion? (2 switches for fan)** A: How far is too far? My switch is between 6 and 8 feet from the shower and it works fine.. You just might have to play with the sensitivity to get it to come on when desired. Ad far as a 3-way application, I don't think it will work. Three way switches have an additional screw for the runner between switches that this switch does not have. **Q: What is the difference between the fs-300-w1 (amazon) and the hs-c00-w7 (big box store)?** A: The same except the HS-C00-W7 has QUE technology. Their claim is it is Ultra Moisture Sensing Adaptive Technology. ## Customer Reviews ### ⭐⭐⭐⭐⭐ No more reminding guests to turn on the exhaust fan *by K***H on December 11, 2018* Update, late summer of 2019: The weather has been cooling off and we have been turning off the AC more often and opening the house for fresh air. The downside of this is that you can't control the humidity of fresh air and my Dewstop switches have been running quite a bit despite turning the humidity sensitivity all the way down. They sense the humidity coming in the window with the fresh air and activate. I finally contacted the company and was very pleased to receive a quick reply that the switches are designed to allow me to turn off the automatic sensing of humidity so that the switch acts like a regular, dumb, on/off switch. The procedure is, make sure the switch is off (no blue light), hold the main on/off button in for at least 15 sec. (The fan will come on when you let go, but just turn it back off, ignore that) This causes the switch to change modes. If the switch was automatically sensing humidity, it stops doing that. If it was in manual mode, holding the button will cause it to switch back to automatic sensing. This is the perfect solution to the problem. During this time of year, because I know I'll have open windows for awhile and plenty of fresh air ventilation in the house, I've set all my switches to manual mode. I can still turn on the fan with a push of the button, it just won't turn on by itself. When winter comes and I close up the house again, I'll revert them all to automatic mode. Well done Dewstop. Update summer of 2019: We are family that likes fresh air when the outside temps are comfortable. Unfortunately, this also means higher humidity levels inside the house. I knew I would have to adjust the switches for "summer mode" and this is my experience. Again, if you're a household that keeps the AC/Heat on year round with the house closed up, this probably won't be an issue for you. As the them outside temps come up and we start opening up the house more, humidity from the outside migrates inside. The switch doesn't know where the humidity comes from, just that its there and so the switch comes on. I turned the sensitivity all the way down, and the switches still come on. I looked in the troubleshooting guide and it talks about the electrical box enclosure. Basically, the box within which the switch is installed, has openings that allow air from inside the wall. This means that overnight, when the house cools down, the inside of the wall cools down also, and during the day when you open the windows and allow warmer air into the room, the switch is potentially feeling air that is slightly cooler inside the wall. The guide says to power down, remove the switches, and seal all openings in the box. However, that just means its now a seal box that is still not breathing to the room within which it is installed. I tested this idea by removing the cover plate so the box is open to the room, in less than an hour, the box had conditioned itself to the room temp and the switch stopped running constantly. So...not sure how to fix that problem. Light switch covers are not design to allow the box to breath from the room, and I'm not convinced that sealing the elec box with solve the problem. Bottom line, if you're purchasing this switch, recommend before installing it, that you seal the elec box first. If it does work, it will save you from having to do it later. So far, works perfectly. Comes on when condensation starts to form and doesn't shut off until the humidity is back under control. I read the negative reviews, and I can see how people might have difficulty with this product. Its sensitivity and automation will be affected by the static humidity in the house, which varies. I have electric heat, which is very dry. My current static humidity is around 45 percent. In the summer with the AC running, my humidity is in the 60s so I assume that I will have to adjust the sensitivity of the switch for summer. If we decide to turn off the AC and open the windows for fresh air, the humidity can get really high and if I don't adjust the switch for that, it will be kicking on often. Bottom line, the switch works great, you have to know the humidity in your home and adjust the switch to compensate for it. I ordered this one as a test, but am so happy with it, I'll be ordering more for the other bathrooms. ### ⭐⭐⭐⭐⭐ Bathroom Exhaust Fan Intelligent Control *by J***H on August 14, 2020* The control device is easy to install for those of us who are experienced in replacing wall switches and outlets. And imagine this: It works as described! When the humidity rises, such as after a shower, it runs the exhaust fan until the humidity drops to normal value. The setting for humidity control is adjustable, so if the default value isn't right for you, you can adjust it accordingly. The unit also has a nice push button which activates the fan for 30 minutes. So, say goodbye to the occasions of the fan being left running for hours and hours, or the instances of the fan being needed but was not used. The push button also serves to stop the fan while running if you wish. Overall, this is a very satisfying product because it works so well. ### ⭐ Great design, stopped working after ~30 days *by J***M on March 20, 2019* Really like the design. Fan would turn on once humidity reaches the set point, and shuts off once it drops below. Worked flawlessly, for about a month, then stopped working automatically. Now the switch only works if it is manually turned on, and shuts itself off after ~20 15 minutes, but I could have purchased much less expensive options for a simple timed switched, and wanted this switch so a bathroom exhaust fan would operate automatically due to on humidity level. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co/products/11468054-dewstop-humidity-sensor-switch-for-bathroom-fan-condensation-control-adjustable](https://www.desertcart.co/products/11468054-dewstop-humidity-sensor-switch-for-bathroom-fan-condensation-control-adjustable) --- *Product available on Desertcart Colombia* *Store origin: CO* *Last updated: 2026-06-08*