Works with a Polar FT60, FT80, or RS300X fitness watch to measure your speed/pace and distance. It wirelessly transmits that data to your watch, which then records and displays it
The G1 is water-resistant to a depth of 65.6' so you can wear it in the rain or when crossing rivers/canoeing, or in virtually any weather
The G1 is powered by one AA battery, which lasts for an average of 10 hours of use

Compatibility : Polar FT60, Polar FT80, Polar RS300X
Display Range : 0-123.7 miles per hour, 0-199 kilometers per hour
Technology : Polar magnetic communication technology
Battery Type : 1 x AA battery (maximum voltage allowed is 3.0 V)
Battery Life : Average 10 hours of use (68o F / 20o C)
Operating Temperature : -4 to 140o F (-20 to +60o C)
Accuracy Distance : +/- 2%
Speed : +/- 2 kilometers per hour
Water Resistance ; 65.6' (20.0 m)

Material
Armband: flexible textile strap: 34 % polyamide, 33 % polyester, 33 % rubber
Other parts: polyamide, silicone

Armband