Crelander New Arrival Bluetooth 4.0 Smart Bracelet Android System Sports Bracelet Health Bracelet OLED Bluetooth Wristbands Smart Watch Smart Bracelet SH01-4.0ERD For IOS7 & Android 4.3 Clock Pedometer Stopwatch Sleep Detector Colorful wristbands ,with compact and lightweight body, simple and stylish ,bring us a high quality of life. Equipped with an organic self-luminous OLED, viewing angle widen above to 60 degree, can effectively save energy and prolong battery life. When bracelet switched to sleep mode ,it can detects your sleep quality intelligently, allowing you to have a glance of yourself sleep quality Gently knocking bracelet screen twice, the smart sensors of the bracelet will capture the vibration, the screen will light up automatically. Data about the scores of sports result and sleeping quality will synchronize to the APP