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💓 Stay connected, stay ahead — your heart’s data, flawlessly delivered.
The Polar T31 Transmitter is a slim, lightweight, and waterproof heart rate sensor that transmits coded 5kHz signals to compatible Polar monitors and gym equipment. Featuring an elastic strap adjustable for chest sizes 25-54 inches, it eliminates signal interference with other devices. With a robust 2500-hour battery life and sweat-resistant design, it’s engineered for reliable, long-lasting performance during intense workouts.

| ASIN | B000ARDPPU |
| Battery Average Life | 2500 Hours |
| Battery Description | Lithium-Ion Polymer |
| Best Sellers Rank | 137,120 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 71 in Heart Rate Monitors (Sports & Outdoors) 3,556 in Fitness Accessories |
| Brand | Polar |
| Brand Name | Polar |
| Colour | Black |
| Compatible Devices | Polar FT2 |
| Compatible devices | Polar FT2 |
| Customer Reviews | 4.3 out of 5 stars 2,839 Reviews |
| Display Size | 54 Inches |
| EU Spare Part Availability Duration | 1 Years |
| Global Trade Identification Number | 00725882017594, 00725882201351 |
| Included Components | Heart Rate Transmitter |
| Item Dimensions L x W x H | 1L x 1W x 1H millimetres |
| Item Type Name | Coded Heart Rate Transmitter and Belt Set |
| Item Weight | 0.09 Kilograms |
| Manufacturer | Polar |
| Manufacturer Part Number | 92053125 |
| Material | Elasticized-Fabric |
| Material Type | Elasticized-Fabric |
| Model Number | 92053125 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Product dimensions | 1L x 1W x 1H millimetres |
| Screen size | 54 Inches |
| Sensor Type | ECG |
| Size | M |
| Team Name | Polar |
| UPC | 725882017594 |
| Unit Count | 1.0 count |
D**N
Excellent product. Works with my Spirit R800 rowing machine
Really pleased with it. It connected immediately to my Spirit R800 rowing machine and works fine.
G**A
It makes it easy to keep a steady pace that keeps me in ...
We cannot go to the gym without our Polar Heart monitors. These work well with most electronic exercise equipment. I watch my heart rate instead of the machine intensity. It makes it easy to keep a steady pace that keeps me in my personal heart rate zone that is good for me. It gives a constant reading without having to grab the heart monitor handles. Washable. I had my first one for about 15 years. I would still be using it, but I accidentally left it somewhere. I replaced it with exactly the same monitor. Great product with a great price. So worth it!!!!!!
M**Y
Works great with gym equipment
I was looking for a heart rate monitor strap to use in the gym, and after searching around decided on the T31 Coded Transmitter. So far so good - it just works with the equipment in my gym (Technogym and Startrac) without any need to do anything other than wear it as described in the brief instruction leaflet. So, I'm pretty pleased with that! It loses a star due to the lack of replaceable battery, though it should last me quite a number of years as I do only use it in the gym. However there are a few guides out there to replacing the battery yourself, even though it's not constructed to allow this
W**E
Good service from supplier
works well with my fairly old polar cs100 computer (as it should being original equipment for the computer).Pity you cannot get the matching speed sensor any more as despite what an american gent would have you believe on U tube (or whatever) neither my brother nor I have managed to replace the battery in that item and neither could I in my original HR monitor. Thank goodness the computer can easily have its battery replaced. |Come on Polar its time original model speed sensors are available. We don,t all want or need fancy new complex bike computers. ,
P**1
Satisfied
The Polar T31 Coded Transmitter and extra strap that I also purchased arrived in a box big enough to take 20 of them with space to spare. I bought this for use in the swimming pool and when I first used it the sensor was picked up by my Polar FT7 immediately. I have only used the transmitter twice so far and I have to say that the connection with my FT7 was constant and it provided EXCELLENT data. It is unobtrusive and you forget that you are wearing it.
R**S
Battery life?
Manufacturer claims 2,500 hours. My second one lasted 9 years, estimate 1,500 hours. First one was similar. I've followed all the advice, washed immediately, kept in a dry environment, so I don't know what else I could have done to get more battery life. Maybe the battery life also depends on years, not just how much it's used. I've bought a new one to work with my original 18 year old receiver. It works fine.
V**.
Good but struggle to communicate to devices I am using during work out
Good but battery does not last it seams. My treadmil struggles to pick it up and the tacx trainer also struggled to recognise it or keep reading it
A**J
Good product, battery replacement not good.
Good product - shame you can't replace the battery, although there is a way supposedly which involves you having to cut the transmitter to insert battery - but this is no good if swimming as it will loose the waterproofing. 3 star because of this. This link is good to check if it will work with your receiver as I got the uncoded version of this and it didn't work with my FT4: [...]
F**4
nulla da dire, fà quel che serve
La fascia precedente è durata più di 5 anni e anzichè sostituirla con un'altra fascia, con poca differenza di prezzo rispetto alla sola fascia, ho acquistato un nuovo cardiofrequenzimentro Polar, comprensivo di fascia, ma altro modello più recente e con più funzioni. Purtroppo, non so se fosse difettoso, rilevava la frequenza cardiaca ma dopo qualche minuto perdeva il battito e diceva di riposizionare la fascia. insomma, durante l'allenamento ero sempre a spostare la fascia, ma la frequenza veniva continuamente persa. Ho deciso di restituirlo e Amazon mi rimborsato immediatamente il prezzo pagato e successivamente mi ha inviato il corriere a ritirare il reso. Un servizio incredibile. In nessun negozio tradizionale si può avere un servizio simile. A quel punto ho ordinato questa fascia, come quella esaurita, per il mio cardiofrequenzimetro e funziona senza nessun tipo di problema. La indosso, accendo il cardio e mi alleno. Per tutta la durata dell'allenamento non perde un battito. La uso anche con il mio stepper Tecnogym, lo accendo e aggancia immediatamente il segnale: favoloso. Avevo solo un dubbio, che la fascia codificata potesse essere solo utilizzata con il suo cardiofrequenzimetro e non con attrezzi cardio, invece funziona perfettamente anche con le comuni macchine da palestra, basta non collegarla al cardiofrequenzimetro da polso. Insomma: pienamente soddisfatto
L**E
Banda
Funcional con caminadoras
S**I
great
The product is excellent, but there is a delivery delay that causes it to take longer than expected.
ア**連
相性が良い
POLARの機器に使用してます バッテリー交換は出来ませんが 機器との相性も良いです。
R**O
Simplesmente não funciona
Uma droga Não funciona. Além de tudo uma dificuldade para tentar devolver
Trustpilot
1 month ago
2 weeks ago