Features:  1. Body temperature measurement: Automatic body temperature measurement throughout the day, when the temperature is measured> 37.3 ℃, the bracelet will automatically alarm to remind.  2. Time / Date.  3. Vibration alarm clock: can set two groups of alarm clocks.  4. Chronograph.  5. Rechargeable lithium polymer battery, fully charged for 30 days.     Note:  The above functions support single watch replacement, without binding mobile phone or computer software.     Specifications:  Measurement accuracy: ± 0.1 ℃ (measured under the liquid pocket).  Measuring range: 30 ~ 45 ℃.  Prompt method: vibration motor.  Display screen: LED light display.  Waterproof level: IPX57.  Charging voltage: DC = 5V (built-in usb can be plugged into the charging treasure to charge).  Product material: strap environmental protection silicone + shell ABS.  Battery capacity: 55mAh 3.7V.  Product weight: about 17g.  Operating environment: -10 ~ 50 ° C.  Product size: about 240*16*8.0mm.     Packing List:  1 x Watch.  1 x English manual