The Corunclima 24/12v DC powered Truck Sleeper Air Conditioner system maintains a cool, dry environment keeping the driver comfortable while Truck Engine-off, unnecessary fuel expense, loud engine noises, engine emissions, and reducing engine wear. It¡¯s driven by Truck battery. 1.Air conditioner use battery to continue to work While the car engine off reduce the cost 2.Brushless motor compressor long life and low maintenance. 3.starting soft, low noise . 4.ISO9001/ TS16949/ QS9000/ CE Certification. 5.More cooling capacity, more cooling air . 6.Still can work 4-5 hours when the vehicel engine stopped. 7.Warranty: 2 years quality warranty Be packed in strong wooden cases/ iron frames/cartons