--- product_id: 47974603 title: "Polar T31 Transmitter" brand: "polar" price: "193.56 DT" currency: TND in_stock: true reviews_count: 13 url: https://www.desertcart.tn/products/47974603-polar-t31-transmitter store_origin: TN region: Tunisia --- # 2500 hours battery life Waterproof & sweat-resistant 5kHz coded transmission Polar T31 Transmitter **Brand:** polar **Price:** 193.56 DT **Availability:** βœ… In Stock ## Summary > πŸ’“ Stay connected, stay ahead β€” your heart’s data, flawlessly delivered. ## Quick Answers - **What is this?** Polar T31 Transmitter by polar - **How much does it cost?** 193.56 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/47974603-polar-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 - β€’ **Sweatproof Slim Design:** Lightweight, waterproof transmitter fits comfortably and stays reliable in intense sessions. - β€’ **Endurance-Ready Battery:** Up to 2500 hours of uninterrupted use keeps you powered through every workout. - β€’ **Universal Compatibility:** Seamlessly pairs with a wide range of Polar monitors and gym equipment for versatile tracking. - β€’ **Precision Heart Rate Sync:** 5kHz coded transmission ensures zero cross-talk with nearby devices for flawless data. - β€’ **Secure Fit for Every Chest:** Elastic strap adjusts from 25 to 54 inches, delivering a snug, distraction-free experience. ## Overview 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. ## Description Shop Polar T31 Coded Transmitter. Free delivery and returns on all eligible orders. Review: 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. Review: Ideal replacement for the flakier fabric version - I bought mine as a replacement for the standard, fabric-based transmitter that shipped with my Polar HRM. I'd been having real problems with the standard transmitter sending crazy readings after extended periods of operation (as have many others judging by the reviews here and elsewhere). I suspected that the failure of my original transmitter was due to moisture getting in via the battery compartment, which is located at the rear of the standard unit. Quite why Polar placed the battery compartment seal right next to very wet and sweaty skin is beyond me. I came to this conclusion having tried every kind of practical remedy suggested by fellow sufferers, none of which made a massive difference. I tested my theory by sealing the back of the unit with tape and vaseline - it worked - but was pretty uncomfortable; although I did at least get some evidence for the moisture theory. I could well be wrong, but the correlation seems fairly strong. Anyway back to this device! the uncoded (but hermetically sealed) old-style belt ! Hasn't missed a beat, literally in this case, despite some very long and hot runs. Yes it's uncoded, yes it might be a little less environmentally sound - but it works. Polar used to offer a recharging service back when this design was standard issue, not sure if they still do. ## 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 | 84,969 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 56 in Heart Rate Monitors (Sports & Outdoors) 2,710 in Fitness Accessories | | Brand | Polar | | Color | Black | | Compatible with | Polar FT2 | | Customer Reviews | 4.2 4.2 out of 5 stars (3,578) | | Date First Available | 19 Aug. 2008 | | Department | Children's | | 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 display length | 14.2 inches | | Item display width | 3.4 inches | | Item model number | 92053125 | | 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 | | Size | M | | Skill level | Advanced | | Sport | Excercise & Fitness | | Style | Coded | | Team | Polar | | Weight | 91 g | | tech_spec_battery_description_toys | Lithium-Ion Polymer | ## Product Details - **Battery description:** Lithium-Ion Polymer - **Battery life:** 2500 Hours - **Brand:** Polar - **Colour:** Black - **Compatible devices:** Polar FT2 - **Item weight:** 0.09 Kilograms - **Material:** Elasticized-Fabric - **Product dimensions:** 1L x 1W x 1H millimetres - **Screen size:** 54 Inches - **Sensor type:** ECG ## Images ![Polar 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 ### ⭐⭐⭐⭐⭐ Excellent product. Works with my Spirit R800 rowing machine *by D***N on 15 July 2025* Really pleased with it. It connected immediately to my Spirit R800 rowing machine and works fine. ### ⭐⭐⭐⭐⭐ Ideal replacement for the flakier fabric version *by C***R on 9 July 2013* I bought mine as a replacement for the standard, fabric-based transmitter that shipped with my Polar HRM. I'd been having real problems with the standard transmitter sending crazy readings after extended periods of operation (as have many others judging by the reviews here and elsewhere). I suspected that the failure of my original transmitter was due to moisture getting in via the battery compartment, which is located at the rear of the standard unit. Quite why Polar placed the battery compartment seal right next to very wet and sweaty skin is beyond me. I came to this conclusion having tried every kind of practical remedy suggested by fellow sufferers, none of which made a massive difference. I tested my theory by sealing the back of the unit with tape and vaseline - it worked - but was pretty uncomfortable; although I did at least get some evidence for the moisture theory. I could well be wrong, but the correlation seems fairly strong. Anyway back to this device! the uncoded (but hermetically sealed) old-style belt ! Hasn't missed a beat, literally in this case, despite some very long and hot runs. Yes it's uncoded, yes it might be a little less environmentally sound - but it works. Polar used to offer a recharging service back when this design was standard issue, not sure if they still do. ### ⭐⭐⭐⭐ Works great with gym equipment *by M***Y on 29 May 2015* 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 ## 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? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/47974603-polar-t31-transmitter](https://www.desertcart.tn/products/47974603-polar-t31-transmitter) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-04-23*