Hailea CPA 120 AC/DC Air Pump Microcomputer-controlled and recharge automatically. Auto switch between AC and DC. Maintenance-free 12V battery inside. Driven by high quality motor for higher air output. Air output can be adjust. Multi-level muffler and damping system, operate with low noise Non-oil lubricated design to produce purified air. Intelligent micro computer control system and protective circuit of battery Battery can be charged when the pump is connected with AC power supply Change automatically to DC when AC if off The DC power can work up to 9 hours when the AC power turns off
