12V DC/230V AC Ventilated Seat Cover China Patent E-Mark Certificate (Other types of Ventilated Seat Cover, Please see -Ventilated Seat Cover,12V DC, 24V DC, 110V AC,230AC was optional.) This newly designed cushion is excellent for back and thigh during long term driving or seating. Features: 1) With this Ventilated Seat Cover, you drive or rest comfortable 2) With a AC/DC adapter, Using it in Car,Home or Office. 3) Adjusting Freely Air Stream by the turn knob on the control unit 4) With a strap to fix Ventilation Seat Cover on the Car Seat/Office Chair/Easy Chair.