Open Machine:  Long Press button more than 3 seconds 

Wireless ；2 batteries included

Wireless models:

Working voltage: 7.4V
Range of use: dual-use for car and home
Rated power: 40W/50W
Battery capacity: 2000mAh
Adjustment: two-speed adjustment
Suction strength.5000pa
Charging time: 1.5h
Life time: 20-30 minutes
Dust cup capacity: 0.2L