HR60 - Product size: 48 x 38 x 12mm. - Net weight : 17g (device without strap or accessories). - Arm strap length : 376mm (upper-arm circumference 20cm-34cm). - Charging time: 2.5h. - Battery working time: about 20 hours. - Waterproof : IPX7. - Transmission : ANT+/BLE. - LED indicator color: LED in Red/Blue/Pink color. - Working temperature : -10°C- 50°C.