If you can not turn on the machine for the first time, please charge a few minutes, showing that the charging state then it can be switched on. Main function -heart rate monitor -call notification -message/twitter reminder -standard sports function(steps distance calories) -time display -sleep detect -shake photograph -anti-lost reminder -smart alarm clock -smart unlock -sports information sharing basic parameters product size: 225mm*16mm*10mm head size: 36mm*11mm*12mm package size: 96mm*96*30mm product weight: 13.7g package weight: 69g band material: TPU control mode: Touch screen: 0.69''oled working time: 5 days working temperature: -20°c-50°c synchronous: Bt4.0le battery capacity: 45mah operating system: Bluetooth 4.0，ios7.0 version above or android 4.4 version above note: Please read the instructions carefully before use, we offer a multilingual instructions. Please download app that name is "day band" before use, facilitate your use. This wristband can link to your phone, time will automatically synchronize. This wristband is waterproof in daily life, when bathing or wash your hands, you can with it. When you swim or dive, please take it off.

• This wristband supports most mainstream phone's Bluetooth connection in the market
• Display health parameters: This black smart bracelet can display the time, steps, distance and calorie clearly
• Sedentary reminder - take a rest to avoid fatigue our smart bracelet has sedentary reminder function to keep fit
• App- you can scan QR code on the instructions and download app in the google play or the apple store

This wristband supports most mainstream phone's Bluetooth connection in the marketKissral