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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Polar T31 Coded Chest Transmitter and Elastic Strap

Polar T31 Coded Chest Transmitter and Elastic Strap

Product ID: 1259687

Details

Battery Life
2500 hours
Brand
POLAR
Color
Black
Compatible Devices
Polar FT2
EU Spare Part Availability Duration
1 years
Item Weight
0.09 kg

⏳2500 hours battery life

💧Water-resistant & sweat-proof

📡5kHz coded transmission

1173 kr

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Description

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

BUILT TO LAST PERFORM - Water-resistant and durable for intense workouts, rain or shine.
ENDURANCE READY BATTERY - Up to 2500 hours of uninterrupted training without battery swaps.
SLEEK COMFORTABLE FIT - Slim, lightweight design with elastic strap fits 25-54 inch chests seamlessly.
UNIVERSAL COMPATIBILITY - Works flawlessly with a wide range of Polar monitors and gym equipment.
PRECISION HEART RATE TRACKING - Coded 5kHz transmission eliminates cross-talk for ultra-accurate data.

The Polar T31 Coded Chest Transmitter and Elastic Strap delivers highly accurate heart rate data via coded 5kHz transmission, preventing interference from nearby devices. Designed for comfort and durability, it fits chest sizes 25-54 inches and offers a robust 2500-hour battery life. Compatible with a broad range of Polar heart rate monitors and gym equipment, this water-resistant transmitter is ideal for professionals and fitness enthusiasts seeking reliable, uninterrupted performance.

Specifications

ASIN	B000ARDPPU
Battery Average Life	2500 hours
Best Sellers Rank	#53,933 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #344 in Electronics & Gadgets
Brand	POLAR
Brand Name	POLAR
Color	Black
Compatible Devices	Polar FT2
Customer Reviews	4.2 out of 5 stars 2,893 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"
Software Update Supported to Date	unknown
Team Name	Polar
UPC	725882017594
Unit Count	1 Count
Warranty Description	2 year manufacturer

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TrustScore 4.5 | 7,300+ reviews

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1173 kr

Duties & taxes included

In stock

Sold byAmazon NorwayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Norway.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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