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HUAWEI BAND 4 DIMENSIONS Band body (Length x width x height): 56 mm (entire length without the strap) x 18.5 mm (width) x 12.5 mm (thickness of the band body) Strap width: 17 mm Strap length: 123 mm + 85 mm WEIGHT Approximqtely 24 g(including the wrist strap) *Product size, product weight, and related specifications are theoretical values only. Actual measurements between individual products may vary. All specifications are subject to the actual product. DISPLAY TFT colour screen Resolution: 80 x 160 pixels Size: 0.96 inches MICROPROCESSOR Apollo 3 OPERATING SYSTEM Android 4.4 or later iOS 9.0 or later SENSORS 3-axis acceleration sensor Infrared wear sensor Optical heart rate sensor BATTERY Capacity: 91 mAh Charging time: about 1.5 hours (in ambient temperature of under 25 °C) 7 days: HUAWEI TruSleep™ is enabled, Heart rate monitoring (Smart mode) is enabled, Raise wrist to wake screen is disabled; 8 days: HUAWEI TruSleep™ is enabled, Heart rate monitoring (Smart mode) is disabled, Raise wrist to wake screen is disabled 9 days: HUAWEI TruSleep™ is disabled, Heart rate monitoring (Smart mode) is disabled, Raise wrist to wake screen is disabled Screen is checked briefly 200 times a day, 50 messages a day, 3 calls a day, 3 alarms a day Data is based on tests results from the Huawei lab. Actual battery life varies depending on your band’s configuration, operations, ambient environment, and how long the battery has been used. *Typical value. Actual capacity may vary slightly. This capacity is the nominal battery capacity. The actual battery capacity for each individual phone may be slightly above or below the nominal battery capacity. ENVIRONMENT Ambient operating temperature: -10 °C – +45 °C BLUETOOTH Bluetooth frequency: 2.4 GHz Bluetooth 4.2 MATERIAL Front cover: Plastic Strap: Silicone rubber CHARGING PORT USB charging port WATER RESISTANCE 5ATM STORAGE ROM: 384 KB ROM: 1 MB Flash: 32 MB BUTTON CONTROL Full screen touch + Home key