... use 2.Refresh the air in the car 3.Improve combustion efficiency Car Economic Coordinator: (CE & ROHS) ... followed:Features Description:1.It can test the car battery or alternator automatically, and in this ... air in the car.3.It can both save the fuel and reduce the emissions, which has a ... -up, trucks, compact car, luxury car, sport car etc. About how CARNUMEN to test the car batteries, release the air ...