Can put a 12V battery voltage regulator and battery (10-14V) output voltage in 121 x Back seat organizer, 24V battery output voltage 24V. Polar powered is stable, and can stable the solar cell voltage fluctuations. Provide your electronic equipment power supply, super pressure lifting design for wide, wide voltage range. System power supply, super pressure lifting design for wide, wide voltage range. Output method: IN+input positive pole, IN-input negative pole output method: OUT+output positive pole, OUT-output negative pole. Module properties: the isolation. Automatic voltage step down module: -input voltage: 3~35V. Adjust method: first connect the input power supply (3-35V) between the output voltage with a multimeter to monitor and adjust potentiometer (general chronological booster, the backward turn step-down). -Output 2.25~30V continue adjust, output actual test is as following: 3V to 5V 0.3A, 5V to 13V 0.3A, 7.4V to 12V 0.5A, 10V to 12V 0.7A, 12V to 12V 0.7A, 12V to 15V 0.6A, 12V to 19V 0.5A, 24V to 12V 1A