Polar T31 Non-Coded Transmitter and Belt Set has a new elastic design with front snaps, 25% smaller, more stable, does not slide, increased comfort level, smaller electrode area.

Compatible with all Polar HRMs except Protrainer XT, Protrainer XT Cycle, XTrainer, S510, S520, S710 and S720i. Backed by two year maintenance free warranty.

Upgrade to the new WearLink Coded Transmitter for increased comfort and reliability. Plus elimate interferance from other heart rate monitors and electronic disturbances.