CATEYE OHR-31 Optical Heart Rate Sensor

Compact wrist watch style Optical LED based heart rate sensor Dual band Bluetooth 50 / ANT+ seamlessly connects to cycling computers and smartphone apps including CatEye Cycling USB rechargeable with up to 24 hours of run-time IPX7 rated to withstand the elements LED low battery indicator and auto shutdown mode maximizes the battery life between charges Includes multiple armband size options to ensure proper fit