Using wireless transmission technology the sensor determines your location by measuring continuously the distance between itself and at least four satellites.

Super tough and water resistant this Polar G1 is made to go the distance with you no matter how hard you train.

Features Running and distance sensor Compatible with Polar RS200 / RS400 / S625X / S725X GPS technology Super tough Transfer frequency 5kHz Power 1 x AA Battery included Operating temperature 20 C to 60 C Accuracy distance / 2 Accuracy speed / 2km/h Water resistant 20m Includes Carry pouch 1 x AA batteries armband Model G1 Brand Polar G1