p At the heart of your training is the coded T31 Its purpose is simple to transmit your heart rate to your wrist unit Slim and light the ECG electrocardiogram accurate transmitter is fully water resistant and designed for all weather conditions p p New elastic design with front snaps 25pct smaller more stable does not slide increased comfort level smaller electrode area Compatible with all Polar Heart Rate Monitors except Protrainer XT Protrainer XT Cycle XTrainer S510 S520 S625x S710 S720i S725x S725 CS100 CS200 CS200cad RS200 and RS200sd p b Features b ul li New elastic design w front snaps 25 smaller more stable does not slide increased comfort level li li Transmitters last approx 2500 hours li li Smaller electrode area li li Compatible with all Polar HRMs except Protrainer XT Protrainer XT Cycle XTrainer S510 and S710 li ul b Compatibile With b ul li FT80 G1 li li FT80 li li FT60 G1 li li CS400 li li FT60 li Style: Sports Resizable: Yes Adjustable: Yes