This product is applicable to the the12V/24V lead acid battery Advanced pulse width modulation (PWM) technology is used to automatically charge batteries through a 4-stage charging cycle The battery life can be significantly improved by digital pulse repairing method for the power chips of microcomputers Constant voltage charging will be arranged to provide various protections and avoid over-voltage, over-current, over-beating and electrode-positive, etc. The 12V input when automatic charging mode, full electric voltage of 13.8V to 14.3V, about 16V input when manual charging mode, must be artificial monitoring in case of overcharge if manual mode charging, suggest stop charging when the battery beating Do not block cooling hole or use the charger with the cooling fan off Specification: Colour: Red Size: Approx. 20.5 x 15 x 9cm/8.07 x 5.91 x 3.54" Power Cord Length: 120cm/47.24" Clip Cord Length: 60cm/23.62" Input Voltage: 110-250V Output Voltage: 12V/24V Current: 0-50a Adjustable Frequency: 50-60HZ Power Supply: Euro Three Charging Modes: Constant Current Mode/Constant Voltage Mode/Trickle Mode What's in the box 1x TG Full Automatic Intelligent Car Battery Charger 200AH 12V/24V