polar-rs300x-G1

HQRP Battery (4-Pack) Compatible with Polar RS300X Heart Rate Monitor (2 Batteries Compatible with Training Computer + 2 Batteries Compatible with Transmitter Polar WearLink)
HQRP Battery (4-Pack) Compatible with Polar RS300X Heart Rate Monitor (2 Batteries Compatible with Training Computer + 2 Batteries Compatible with Transmitter Polar WearLink)
R 912