Rated output: 12V 6A. Battery range: 12V: 4Ah-120Ah 24V: 6AH - 100AH. AI smart chip, the latest upgraded touch button in 2020, multiple protection. SMART TOUCH BUTTONS. Connect the red clamp (+) to the positive pole and the black clamp (-) to the negative pole of the battery (if the battery is connected incorrectly, error code “E - -” will be displayed on the screen).