--- product_id: 259618119 title: "T31 Transmitter" brand: "polar" price: "555 kr" currency: DKK in_stock: true reviews_count: 6 category: "Polar" url: https://www.desertcart.dk/products/259618119-t31-transmitter store_origin: DK region: Denmark --- # 2500 hours battery life Waterproof & weatherproof 5kHz coded transmission T31 Transmitter **Brand:** polar **Price:** 555 kr **Availability:** ✅ In Stock ## Summary > 💓 Stay ahead of the pack with precision heart rate tracking that never quits! ## Quick Answers - **What is this?** T31 Transmitter by polar - **How much does it cost?** 555 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/259618119-t31-transmitter) ## Best For - polar enthusiasts ## Why This Product - Trusted polar brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - ‱ **All-Weather Durability:** Fully waterproof and built to withstand sweat, rain, and even swimming sessions—train without limits. - ‱ **Endurance-Ready Battery:** Up to 2500 hours of use means your training companion won’t quit before you do. - ‱ **Universal Compatibility:** Works flawlessly with a wide range of Polar monitors and compatible gym equipment—stay connected wherever you train. - ‱ **Precision Heart Rate Sync:** Seamlessly transmits your heart rate with 5kHz coded signal to avoid interference and ensure accuracy. - ‱ **Sleek & Lightweight Comfort:** Slim, featherlight design fits chest sizes 25-54 inches for all-day wear without distraction. ## Overview The Polar T31 Transmitter is a slim, lightweight, and waterproof heart rate transmitter that uses a 5kHz coded signal to deliver accurate heart rate data to a broad range of Polar monitors and compatible gym equipment. Designed for chest sizes 25 to 54 inches, it features a long-lasting battery with up to 2500 hours of use and eliminates signal cross-talk for reliable performance in all training environments. ## Description Product Description At the heart of your training is the Polar T31 Coded Transmitter. Its purpose is simple: to transmit your heart rate to your wrist unit. Slim and light, the ECG (electrocardiogram) accurate transmitter is fully water resistant and designed for all weather conditions. Compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5. Set Contains: T31 coded transmitter, fabric elastic strap Review: great - The product is excellent, but there is a delivery delay that causes it to take longer than expected. Review: Ceinture + Ă©metteur Polaris CODÉ Ă©tanche fonctionnant avec une pile scellĂ©e d'une autonomie de 2000 Ă  2500 Heures. Donc autant dire que la longĂ©vitĂ© est suffisante car vous parcourez en ce temps environ 38 000 km en avirons ; ce qui est consĂ©quent & amplement suffisant -- c'est un tour du monde ! Cette sangle remplace ma prĂ©cĂ©dente qui au bout de 22 ans avait toujours une pile fonctionnelle mais dont le matĂ©riau fissurait. Donc pour rĂ©sumer, cet Ă©metteur vous servira quotidiennement & assurĂ©ment huit annĂ©es durant ! Ensuite, ce qui est important -- & Ă  mon sens essentiel --, cet Ă©metteur CODÉ est parfaitement compatible avec le rĂ©cepteur non-condĂ© Polaris qui Ă©quipait jusqu'en 2008 les concept - II - modĂšle C en Europe (aux US -- modĂšle codĂ©e diffĂ©rent). La compatibilitĂ© est avĂ©rĂ©e bien que ni Polaris ni Concept ne dĂ©livrent ce genre d'information ; ce qui est regrettable pour ces marques. Enfin, pour faire fonctionner l'Ă©metteur : il faut soit mouiller, soit humecter avec du gel les rĂ©cepteurs intĂ©rieurs de la bande ; c'est Ă©videmment inutile dans l'eau puisque l'Ă©quipement peut aussi servir pour la natation. ## Features - Transmits heart rate data to Polar heart rate monitors using 5kHz transmission and compatible gym equipment. Compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5 - Compatible products:Elastic straps.Individually coded to pick up your heart rate monitor and not others nearby. This eliminates cross-talk with other electronic devices in the same area. - Slim, lightweight, and waterproof design - Fits 25 to 54 inch chest size - Average battery lifetime is 2500 hours of use. Non user replaceable battery ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000ARDPPU | | Action | add | | Batteries | 1 CR123A batteries required. (included) | | Batteries Included? | Yes | | Best Sellers Rank | #93,305 in Sporting Goods ( See Top 100 in Sporting Goods ) #144 in Sports Heart Rate Monitors | | Brand | Polar | | Color | Black | | Compatible with | Polar CS100, Polar CS200cad, Polar CS300, Polar F11, Polar FT2, Polar FT4, Polar FT40, Polar FT60, Polar FT7, Polar FT80, Polar RCX5, Polar RS100, Polar RS300X, Polar RS400 | | Customer Reviews | 4.3 4.3 out of 5 stars (2,773) | | Date First Available | 6 August 2012 | | Department | Children's | | Description Pile | Lithium-Ion | | Display Size | 54 Inches | | Features | Lightweight design, Slim, Transmits heart rate | | Height | 0.8 inches | | Included Components | Heart Rate Transmitter | | Is Discontinued By Manufacturer | No | | Item model number | 92053125 | | Length | 14.2 inches | | Manufacturer | Polar | | Material Type | Elasticized-Fabric | | Number of Items | 1 | | Power Source | battery-powered | | Product Dimensions | 0.1 x 0.1 x 0.1 cm; 89 g | | Shape | Heart | | Size | standart | | Skill Level | Advanced | | Sport | Excercise & Fitness | | Style | Coded | | Team | Polar | | Weight | 0.2 Pounds | | Width | 3.4 inches | ## Product Details - **Brand:** Polar - **Colour:** Black - **Material:** Elasticized-Fabric - **Screen size:** 54 Inches ## Images ![T31 Transmitter - Image 1](https://m.media-amazon.com/images/I/614acgZzr8L.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: How do you change the battery?** A: Although the unit is designed NOT to have the battery replaced, it can be done. It takes a CR2032 coin type battery.I followed this video and successfully replaced mine in under ten minutes.https://youtu.be/lBsv9XoV6aA **Q: Is it compatible with a life fitness treadmill? If so how can it be connected?** A: Yes it is compatible, actually I purchased for same treadmill brand . It is conected automatically by gymlink so no setup is required. Great product . **Q: how do you pair this t31 with compatible treadmill machines with polar sign on it?** A: Pairing is automatic. Just start your workout and it will sync with a little sweat **Q: Does the t31 work with the iphone 5? I've tried without success using both MapMyRide and the Polar App. Cheers M** A: The problem is that you need the device to be capable of acquiring data from the transmiter in it's own frequency and I do not think that the iphone is able to do that without a special additional device. For example you have a app called sports tracker that has its own heart rate monitor, I do not know how it works gut there must be some way to catch the information from the heart rate monitor to the phone. For what I know is very probable that you should need some additional device to get the heart rate monitor frequency. ## Customer Reviews ### ⭐⭐⭐⭐ great *by S***I on 16 December 2024* The product is excellent, but there is a delivery delay that causes it to take longer than expected. ### ⭐⭐⭐⭐⭐ Review *by D***D on 13 June 2020* Ceinture + Ă©metteur Polaris CODÉ Ă©tanche fonctionnant avec une pile scellĂ©e d'une autonomie de 2000 Ă  2500 Heures. Donc autant dire que la longĂ©vitĂ© est suffisante car vous parcourez en ce temps environ 38 000 km en avirons ; ce qui est consĂ©quent & amplement suffisant -- c'est un tour du monde ! Cette sangle remplace ma prĂ©cĂ©dente qui au bout de 22 ans avait toujours une pile fonctionnelle mais dont le matĂ©riau fissurait. Donc pour rĂ©sumer, cet Ă©metteur vous servira quotidiennement & assurĂ©ment huit annĂ©es durant ! Ensuite, ce qui est important -- & Ă  mon sens essentiel --, cet Ă©metteur CODÉ est parfaitement compatible avec le rĂ©cepteur non-condĂ© Polaris qui Ă©quipait jusqu'en 2008 les concept - II - modĂšle C en Europe (aux US -- modĂšle codĂ©e diffĂ©rent). La compatibilitĂ© est avĂ©rĂ©e bien que ni Polaris ni Concept ne dĂ©livrent ce genre d'information ; ce qui est regrettable pour ces marques. Enfin, pour faire fonctionner l'Ă©metteur : il faut soit mouiller, soit humecter avec du gel les rĂ©cepteurs intĂ©rieurs de la bande ; c'est Ă©videmment inutile dans l'eau puisque l'Ă©quipement peut aussi servir pour la natation. ### ⭐⭐⭐⭐⭐ Review *by L***E on 12 February 2025* Funcional con caminadoras ## Frequently Bought Together - Polar T31 Coded Chest Transmitter and Elastic Strap - Polar H9 Heart Rate Sensor - hengkang Fit for Polar FT4/FT7 Watch Bands, Stylish Adjustable Silicone Replacement Band Straps Wristbands Accessory Band Bracelet --- ## 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.dk/products/259618119-t31-transmitter](https://www.desertcart.dk/products/259618119-t31-transmitter) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-22*