Built-in high-precision temperature sensor to monitor body temperature throughout the day. When the measured temperature exceeds 37.3 degrees Celsius, the bracelet displays the current temperature, vibrates, and shows a green, yellow, or red indicator light. Supports time and date display and stopwatch function. Vibration alarm clock allows setting two groups of alarms. Equipped with a built-in rechargeable battery that lasts up to 30 days on a full charge. No need to pair with a mobile phone or computer software. Item Name: Smart Bracelet Case Material: ABS Strap Material: Silicone Measurement Accuracy: ±0.1 degree Celsius (measured under the armpit) Measurement Range: 30–45 degrees Celsius Alert Method: Vibration Motor Display Screen: LED Light Display Waterproof Rating: IPX57 Charging Voltage: DC 5V (supports USB charging) Battery Capacity: 3.7V, 75mAh (included) Operating Environment: -10 to 50 degrees Celsius Features: Temperature measurement, vibration alarm, comfortable to wear Strap Length: 240mm / 9.45 inches (approx.) Strap Width: 16mm / 0.63 inches (approx.) Strap Thickness: 8mm / 0.31 inches (approx.) Note: Due to lighting and screen settings, the item's color may vary slightly from the images. Slight dimensional differences may occur due to manual measurement. Package Includes: 1 x Smart Bracelet, 1 x User Manual