Product Description Brand: ROCKBROS Material: Casing: ABS Chest Strap: 45% high-elasticity nylon, 41% elastic webbing, 14% polyester thread Dimensions: 59.5 × 33.5 × 10.5 mm (Sensor) / 3 cm × 65–95 cm (Chest Strap, adjustable) Weight: 13 g (Sensor) + 32 g (Chest Strap) Wireless Connection: Bluetooth 4.0 (10 m), ANT+ (6 m) Battery: CR2032 Button Cell Battery Life: Up to 800 hours Heart Rate Range: 30–240 BPM BLUETOOTH & ANT+ DUAL MODE: Easily connects to smartphones, bike computers, sports watches, and smart trainers through reliable dual transmission for versatile workout tracking. ACCURATE REAL-TIME DATA & APP SYNC: Delivers precise real-time heart rate monitoring. Syncs directly with popular apps like Strava for seamless activity tracking and analysis. ULTRALIGHT & COMFORTABLE: Weighing only 13 g, the sensor is extremely lightweight. The highly elastic, non-slip textile chest strap ensures a stable and comfortable fit during any activity. LONG 800-HOUR BATTERY LIFE: Powered by a replaceable CR2032 button cell, it provides up to 800 hours of use, offering months of reliable performance with minimal maintenance. IP67 WATERPROOF & EASY TO CLEAN: Resistant to sweat and rain (IP67 rated). Suitable for swimming (dry after use). Removable chest strap for easy cleaning.