Specification Hardware Watch Brand: SMABuilt-in Chip Type: MTK2502Screen Resolution: 240 x 240ROM+RAM: 64MB+128MB Operating Mode: Touch ScreenDial Shape: RoundCase Material: Stainless SteelBand Material: Stainless Steel/ LeatherBluetooth Version: Bluetooth 4.0Compatible OS: Android 4.0,IOS 8.0 or aboveAPP Name: SMA WEAR (search the name in the Google Play)Language:Dutch,English,French,German,Italian,Polish,Portuguese,Russian,Spanish,Turkish Functions Bluetooth Calling: Phone Call ReminderMessage & Information Reminder (Facebook,Gmail,Twitter,Wechat,QQ)Heart Rate MonitorPedometerSedentary ReminderSleep MonitorRemote CameraRemote MusicFind Phone FunctionAlarmCalculatorCalenderVoice RecorderWeather ForecastWaterproof Resistance:IP54,not for shower,swim,dive.Watch DetailsBattery Type: Polymer BatteryBattery Capacty: 300mAhCharging Time: About 2 hoursStandby Time: About Two DaysDial Size: 4.3 x 4.3 x 1.3 cm/ 1.69 x 1.69x 0.51 inchesBand Width: About 2.2 cm/ 0.87 inchesBand Length: About 23.5 cm/ 9.37 inchesBand Material: NO.1/ 2 is Leather, NO.3/ 4 is Stainless SteelWatch Weight: 74g