Built-in high-precision temperature sensor, which can monitor your body temperature all day. When the measured temperature is above 37.3 degree Celsius, this bracelet will display the current temperature and vibrate, and the indicator light will be green/yellow/red color. Support time amp; date display and stopwatch. The vibration alarm clock can set two groups of alarm clocks. Built-in rechargeable battery, can work for 30 days with a full charge. No need to bind a mobile phone or a computer software. Item Name: Smart Bracelet Case Material: ABS Strap Material: Silicone Measurement Accuracy: plusmn; 0.1 Degree Celsius (Measured Under The Armpit) Measurement Range: 30-45 Degree Celsius Prompt Method: Vibration Motor Display Screen: LED Light Display Waterproof Level: IPX57 Charging Voltage: DC 5V (Support USB Charging) Battery Capacity: 3.7V, 75mAh (Included) Operating Environment: -10 Degree Celsius to 50 Degree Celsius Features: Temperature Measurement, Vibration Alarm, Comfortable to Wear Strap Length: 240mm/9.45inch; (Approx.) Strap Width: 16mm/0.63inch; (Approx.) Strap Thickness: 8mm/0.31inch; (Approx.) Notes: Due to the light and screen setting difference, the item 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Smart Bracelet 1 x User Manual