Description- M4 Smart band 4 Fitness Tracker Watch Sport bracelet Heart Rate Blood Pressure Smartband Monitor Health Wristbands for Mi band 4- black IP67 Waterproof (you can wear it to rain, wash hands and take a cold bath, but don't put it into warm water) Bluetooth Push Support (Caller, SMS Messenger, app news reminders- QQ/Facebook/Twitter/Wechat etc) Support Heart Rate / Blood pressure / Blood oxygen monitoring/Sleep monitoring, Support Multi sports Modes ( Running / Riding / Climbing / Swimming / Pingpong / Walking etc) Major function- Find equipment, alarm clock reminders, take pictures, drink reminders, gesture intelligence control, do not interfere with the mode, to remind the mode, heart rate automatic detection Specifications- Screen size： 0.96 inch TFT IPS color screen Screen resolution-160x80 Bluetooth ：4.0 (low power consumption) Waterproof index： IP67 Motor-Built in, vibratng reminder Sensor-G-sensor chip-BK3431Q Appearance material top shell- alloy Strap- Silica Strap FLASH memory：16M Strap size：Total length 235MM, adjustable length 155-210MM Battery type： lithium battery 90mAh Charging type：USB Charge Charging time is about 3 hours Normal use time- 10days Standby time：14days Control mode：touch button control Bracelet showing ：international icon supports languages-Simplified Chinese, English, German, Russian, French, Portuguese, Spanish, Italian, Hindi, Arabic Compatible system- Android 4.4 (included), IOS8.0 (included) or above. Features- 1. Heart rate monitoring, monitoring blood pressure, blood oxygen monitoring. 2. Monitor sleep, move steps, and raise your hand on a bright screen. 3. Call reminder, WeChat, SMS, QQ, and other information content transmission, information storage, remote, alarm reminder, sedentary reminder. Package list- 1x Smartwatch 1XUser Manua