CATEYE OHR-31 Optical Heart Rate Sensor – Bluetooth/ANT+, USB Rechargeable Armband HR Monitor for Road, MTB & Gravel Cycling, 24 Hour Battery Life, IPX7 Waterproof, Fitness/Smartphone App Compatible

Price: $74.95 - $69.95
(as of Feb 25, 2026 11:17:17 UTC – Details)


Next Generation Wrist Watch style Dual-band Bluetooth and ANT+ Optical Heart Rate Sensor that makes the older cumbersome heart rate chest straps a thing of the past.
OPTICAL HEART RATE SENSOR: Compact wrist watch style Optical LED based heart rate sensor.
DUAL BAND: Bluetooth 5.0 / ANT+ seamlessly connects to cycling computers and smartphone apps, including Cateye Cycling.
USB RECHARGEABLE: USB rechargeable with up to 24 hours of run-time.
IPX7 WATERPROOF: IPX7 rated to withstand the elements.
POWER SAVING DESIGN: LED low battery indicator and auto shutdown mode maximizes the battery life between charges.
UNIVERSAL FIT: Includes multiple armband size options to ensure proper fit.
DIMENSIONS/WEIGHT: 1-49/64″ x 1-19/64″ x 15/32″ (45 × 33 ×12 mm) / 0.39 oz (11 g) (Excluding the arm band).