--- product_id: 1259687 title: "Polar T31 Coded Chest Transmitter and Elastic Strap" brand: "polar" price: "€ 2.26" currency: EUR in_stock: false reviews_count: 13 url: https://www.desertcart.pt/products/1259687-polar-t31-coded-chest-transmitter-and-elastic-strap store_origin: PT region: Portugal --- # 2500 hours battery life Water-resistant design 5kHz coded transmission Polar T31 Coded Chest Transmitter and Elastic Strap **Brand:** polar **Price:** € 2.26 **Availability:** ❌ Out of Stock ## Summary > πŸ’ͺ Stay ahead of the pack with pinpoint heart rate precision! ## Quick Answers - **What is this?** Polar T31 Coded Chest Transmitter and Elastic Strap by polar - **How much does it cost?** € 2.26 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/1259687-polar-t31-coded-chest-transmitter-and-elastic-strap) ## 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€’ **Sleek & Sweatproof:** Slim, lightweight, and fully water-resistant for any workout - β€’ **Universal Fit Comfort:** Elastic strap fits chest sizes 25-54 inches snugly and securely - β€’ **Seamless Compatibility:** Works flawlessly with a wide range of Polar heart rate monitors and gym equipment - β€’ **Endurance-Ready Battery:** Up to 2500 hours of uninterrupted training power - β€’ **Precision Heart Rate Sync:** Coded 5kHz signal eliminates cross-talk for ultra-accurate data ## Overview The Polar T31 Coded Chest Transmitter with elastic strap delivers highly accurate heart rate data via a coded 5kHz transmission that prevents interference from nearby devices. Designed for durability and comfort, it features a slim, lightweight, and water-resistant build with an elastic strap fitting chest sizes 25 to 54 inches. With a robust 2500-hour battery life and compatibility across numerous Polar heart rate monitors and gym equipment, it’s the trusted choice for professionals and fitness enthusiasts aiming for precise training insights. ## Description desertcart.com Slim, lightweight, and water-resistant, the Polar T31 coded transmitter and belt set accurately transmits your heart rate data to your Polar wrist-top computer. As a result, it's easy to monitor your heart rate during training runs. This version of the T31 coded, meaning it prevents crosstalk from other electronic devices to ensure complete accuracy (Polar also sells a non-coded T31). It's also built to last, with a design that holds up to 2,500 hours of training usage. The transmitter belt--which works with all current Polar wrist-top computers except the CS600 and RS800--includes a sealed transmitter and elastic strap. About Polar The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.Getting Started Getting started with your T31 Coded Transmitter is easy. For best results, thoroughly moisten the back electrode areas of the transmitter with water and adjust the strap length to fit snug, but comfortable. Check that the moist electrode areas are firmly against your skin and that the Polar logo is in the upright position. Tip: When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel. Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place. Tip: When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel. Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place. Product Description Slim, light and fully water resistant transmitter that prevents cross-talk from other electrical devices for accurate measurement. Review: Great Compatibility - Bought to replace old stretched out one. Works very well. Review: 2 year battery life BUT read the whole review - I bought this "NEW" in June of 2016. In July 2018 it started not broadcasting my heart rate for about the first 20 minutes every workout until it gets warm and a little sweaty, then it starts working, slowly coming down from 220 indicated BPM or so to what my actual heart rate is. (my heart doesn't go 220-bpm) There are 25 spinning bikes in the room, it does the same thing ON ALL 25 BIKES, EVERY SINGLE BIKE SAME THING, so it is not the heart rate indicator on "THE BIKE"! I have used Polar HRMs since the 1990s maybe 1980s? Within the last 5 or 10 years or so the battery life has gotten shorter and shorter. Maybe mine sat on the shelf in some department store or in some bike shop for the first 5 or 10 years of its life before I bought it "NEW" from desertcart? I honestly don't know what to do. I have to buy another one because all the equipment i use at the health club (where i work) is Polar compatible. Maybe the non-coded one is cheaper and will last longer, we will see. This is a follow up, March 2019. I tried an experiment for the last month or two. I run the transmitter under water in the sink at the health club for a second or 2, just to make it wet. I put it on wet and i go into the spinning room and it works perfectly the second i turn on the heart rate indicator on the bike. All the way through the workout it works perfectly. SO if you have one that stopped working or works intermittently, run it under water and put it on to see if that makes it work. Maybe it is an indicator that the battery is getting low but this saved me from buying a new one at this time. Good luck! ## 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 | | Battery Average Life | 2500 hours | | Best Sellers Rank | #62,676 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #388 in Electronics & Gadgets | | Brand | POLAR | | Brand Name | POLAR | | Color | Black | | Compatible Devices | Polar FT2 | | Customer Reviews | 4.2 out of 5 stars 2,890 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 | 0.04"L x 0.04"W x 0.04"H | | Item Type Name | Coded Heart Rate Transmitter and Belt Set | | Item Weight | 0.09 kg | | 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 | 0.04"L x 0.04"W x 0.04"H | | Screen Size | 54 inches | | Sensor Type | ECG | | Size | 54" | | Team Name | Polar | | UPC | 725882017594 | | Unit Count | 1 Count | | Warranty Description | 2 year manufacturer | ## Product Details - **Battery Description:** Lithium-Ion - **Battery Life:** 2500 hours - **Brand:** POLAR - **Color:** Black - **Compatible Devices:** Polar FT2 - **Item Weight:** 0.09 kg - **Material:** Elasticized-Fabric - **Product Dimensions:** 0.04"L x 0.04"W x 0.04"H - **Screen Size:** 54 inches - **Sensor Type:** ECG ## Images ![Polar T31 Coded Chest Transmitter and Elastic Strap - Image 1](https://m.media-amazon.com/images/I/614acgZzr8L.jpg) ## 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 Compatibility *by M***K on August 6, 2026* Bought to replace old stretched out one. Works very well. ### ⭐⭐⭐⭐⭐ 2 year battery life BUT read the whole review *by A***R on December 27, 2018* I bought this "NEW" in June of 2016. In July 2018 it started not broadcasting my heart rate for about the first 20 minutes every workout until it gets warm and a little sweaty, then it starts working, slowly coming down from 220 indicated BPM or so to what my actual heart rate is. (my heart doesn't go 220-bpm) There are 25 spinning bikes in the room, it does the same thing ON ALL 25 BIKES, EVERY SINGLE BIKE SAME THING, so it is not the heart rate indicator on "THE BIKE"! I have used Polar HRMs since the 1990s maybe 1980s? Within the last 5 or 10 years or so the battery life has gotten shorter and shorter. Maybe mine sat on the shelf in some department store or in some bike shop for the first 5 or 10 years of its life before I bought it "NEW" from Amazon? I honestly don't know what to do. I have to buy another one because all the equipment i use at the health club (where i work) is Polar compatible. Maybe the non-coded one is cheaper and will last longer, we will see. This is a follow up, March 2019. I tried an experiment for the last month or two. I run the transmitter under water in the sink at the health club for a second or 2, just to make it wet. I put it on wet and i go into the spinning room and it works perfectly the second i turn on the heart rate indicator on the bike. All the way through the workout it works perfectly. SO if you have one that stopped working or works intermittently, run it under water and put it on to see if that makes it work. Maybe it is an indicator that the battery is getting low but this saved me from buying a new one at this time. Good luck! ### ⭐⭐⭐⭐⭐ Changed the way I work out *by A***K on February 9, 2012* I purchased this heart rate monitor transmitter to replace the one I lost. I use a Polar F6 (A few years older model) and it works flawlessly with it. I'm 6'2" with a 42" chest and this strap fits comfortably with little adjusting. When I'm working out I don't feel it and the slender form factor doesn't show through my clothes when I'm exercising, but I suppose it could if you wore tighter fitting clothing such as those Under Armor shirts or a bicycling shirt. The transmitter communicates well with the Precor machines at my gym, however I have noticed that it reads about 1 BPM off between my watch & the exercise machine. It's not that big of a deal, it's just something to point out. Using the Polar brand, you're introduced to the OwnZone, which is a custom tailored heart rate range for the day. It's really a great tool to use. I now focus on getting my heartrate into that range as quick as I can and keep it there throughout my workout. Make sure you read the instructions and wet the transmitter areas before you work out. This will help transmitting and if the exercise machine you're on isn't reading properly, I found that moving the band down a 0.5" to 1" will make it start reading normally. I've heard the big negative to this device is that the battery must be changed by the factory and it's less expensive to replace the entire product. With an approximate 1-3 year battery life, I'll probably purchase another rather than send it in and wait for the turn around. ## 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.pt/products/1259687-polar-t31-coded-chest-transmitter-and-elastic-strap](https://www.desertcart.pt/products/1259687-polar-t31-coded-chest-transmitter-and-elastic-strap) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-07*