ROCKBROS HRM812 Heart Rate Monitor Chest Strap – ANT + Bluetooth IP67 Waterproof, 800H Battery Life, Wide Compatibility

EASY CONNECTION & AUTO WAKE – SLEEP:Connect to mobile phones via Bluetooth for instant use. Features auto – wake when correctly worn (starts working as heart rate belt is properly on) and auto – sleep when detached, no need to manually switch on/off.
LONG BATTERY LIFE:Powered by a CR2032 button battery, it offers an 800 – hour long battery life. No frequent charging needed, convenient for daily fitness and outdoor sports. Heart rate range covers 30 – 240 BPM. Easy battery replacement – use a coin – like tool to open the battery door and replace following instructions.
LIGHTWEIGHT & ERGONOMIC DESIGN:The heart rate sensor is lightweight (main unit 59.5×33.5×10.5mm, ~13g; chest strap 3cm×65 – 95cm, ~32g) and ergonomically designed. The detachable main unit fits skin well, avoiding slipping during exercise. Easy to clean the chest strap and replace the battery.