Polar heart rate sensors | Change the battery - YouTube
Other Sports Watch Brands - POLAR S720i Bundle (Heart Rate Monitor, Watch, Speed Sensor, Etc....) **R3500** was sold for R1,895.00 on 19 May at 21:33 by Timeless Board Games in Johannesburg (ID:21965369)
Polar Speed Sensor & Bike Mount S720i S710i S520 S510 XTrainer Plus Protrainer 725882278391 | eBay