1. Voltage: 3.7V 2. Charging time: 20 minutes 3. Battery: polymer lithium battery (130 mAh) 4. Dimensions: 51x50x24 mm 5. Material: ABS 6. Small size, easy to carry 7. Easy Bluetooth connection, more intimate use 8. Use: Unplug the plug to emit a 130-decibel alarm sound and trigger the SOS automatic alarm function through the APP. Double-click the button to quietly alarm and send SMS/telephone/real-time location
