4 WAYS POWER SUPPLY T-SUNiceM 12v refrigerator can works with dewalt 18-20v max lithium battery(included dewalt battery adapter, battery is NOT included), and equipped with 110/240V AC and 12/24V DC adapters. If you have any questions after receiving the adapter, please feel free to contact us. HIGH EFFICIENCY & LOW ENERGY CONSUMPTION The refrigerator compressor has two modes: ECO/MAX. Switch to MAX" mode if you need to quickly cool down to a lower temperature. Switch to ECO" mode to save energy if you only keep the rv refrigerator at a constant temperature. It can be adjusted at different temperatures between -4 F-68 F (-20 C to 20 C) for refrigeration or freezing.