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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描述

Stay in the zone! 🏃‍♂️

📏 ADJUSTABLE FIT - Comfortably fits chest sizes from 25 to 54 inches.
🌊 SLIM WATERPROOF - Designed to withstand sweat and splashes while remaining lightweight.
🔒 SECURE CONNECTION - Individually coded to prevent cross-talk with nearby devices.
🔋 LONG LASTING POWER - Enjoy up to 2500 hours of use with a non-replaceable battery.
🏋️‍♂️ GYM COMPATIBILITY - Works seamlessly with a wide range of Polar heart rate monitors and gym equipment.

The Polar T31 Transmitter is a cutting-edge heart rate monitor that transmits data using 5kHz technology, ensuring a secure and interference-free connection with compatible Polar devices. Its slim, lightweight, and waterproof design makes it perfect for any fitness enthusiast, while the adjustable strap accommodates a wide range of chest sizes. With an impressive battery life of 2500 hours, this transmitter is built for long-term performance.

规格

Action	add
Color	Black
Size	standart
Style	Coded
Team	Polar
Compatible with	Polar FT2, Polar RS100, Polar FT7, Polar FT4, Polar F11, Polar CS100, Polar FT40, Polar FT60, Polar FT80, Polar RS300X, Polar CS300, Polar CS200cad, Polar RCX5, Polar RS400
Display Size	54 Inches
Height	0.8 inches
Length	14.2 inches
Weight	0.2 Pounds
Width	3.4 inches
Shape	Heart
Material Type	Elasticized-Fabric
Number of Items	1
Power Source	battery-powered
Skill Level	Advanced
Features	Transmits heart rate, Slim, Lightweight design
Sport	Excercise & Fitness
Included Components	Heart Rate Transmitter
Batteries Included?	Yes
Description Pile	Lithium-Ion, Non-replaceable
Brand	Polar
Department	Children's
Manufacturer	Polar
Item model number	92053125
Product Dimensions	0.1 x 0.1 x 0.1 cm; 89 g
ASIN	B000ARDPPU