How do you change the battery?

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

Is it compatible with a life fitness treadmill? If so how can it be connected?

Yes it is compatible, actually I purchased for same treadmill brand . It is conected automatically by gymlink so no setup is required. Great product .

how do you pair this t31 with compatible treadmill machines with polar sign on it?

Pairing is automatic. Just start your workout and it will sync with a little sweat

Does the t31 work with the iphone 5? I've tried without success using both MapMyRide and the Polar App. Cheers M

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.

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T31 Coded Chest Transmitter and Elastic Strap

Product ID: 1259687

Details

Battery Description
Lithium-Ion
Battery Life
2500 hours
Brand
POLAR
Color
Black
Compatible Devices
Polar FT2
Item Weight
0.09 kg

⏳2500 hours battery life

💧Water-resistant design

📡5kHz coded transmission

€ 109.03

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💪 Stay ahead of the pack with pinpoint heart rate precision!

SLEEK SWEATPROOF - Slim, lightweight, and fully water-resistant for any workout
UNIVERSAL FIT COMFORT - Elastic strap fits chest sizes 25-54 inches snugly and securely
SEAMLESS COMPATIBILITY - Works flawlessly with a wide range of Polar heart rate monitors and gym equipment
ENDURANCE READY BATTERY - Up to 2500 hours of uninterrupted training power
PRECISION HEART RATE SYNC - Coded 5kHz signal eliminates cross-talk for ultra-accurate data

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.

Specifications

ASIN	B000ARDPPU
Battery Average Life	2500 hours
Battery Description	Lithium-Ion
Best Sellers Rank	#51,264 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #350 in Electronics & Gadgets
Brand Name	POLAR
Color	Black
Compatible Devices	Polar FT2
Customer Reviews	4.2 4.2 out of 5 stars (2,889)
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 Type	Elasticized-Fabric
Model Number	92053125
Number of Items	1
Number of Packs	1
Sensor Type	ECG
UPC	725882017594
Unit Count	1 Count
Warranty Description	2 year manufacturer

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