1. Charging time: 8 hours; full charging working time: 200 minutes; 

2. Charging current: 60-80ma; charge protection voltage: 4.2 ± 0.05v; discharge protection voltage: 3.2V ± 0.05; 

3. Working ultrasonic frequency: 1.8mhz; 

4. Battery capacity: 600mA; 

5. Battery internal resistance < 100m Ω.