Features 1,High-end technology MPPT solar maximum power tracking charge management chip, with trickle, constant current, constant voltage charging management 2,The use of imported high-frequency low-conduction resistance double MOS tube, high current diode, high efficiency flat high-power inductors, alloy current detection resistor 3,The large aluminum cooling fin at the bottom , ensure it keep stability working at the high current 4,High-speed and efficient way of charging, heat small, fast 5,Dual status indicator light, no battery when the red light flashes green light is always on, charging red light, full of self-stop while the green light Specification Descriptions: 1. Nominal 12V (10.8V 11.1V) full charge voltage 12.6V lithium battery .3 string lithium battery charge management board.3A high current intelligent trickle, constant current, constant voltage charging management board. Features: The use of imported high-frequency low-conduction resistance double MOS tube, high current diode, high efficiency flat high-power inductors, alloy current detection resistor. The large aluminum cooling fin at the bottom, ensure it keep stability working at the high current. High-speed and efficient way of charging, heat small, fast. Dual status indicator light, no battery when the red light flashes green light is always on, charging red light, full of self-stop while the green light. Specifications: Output current: maximum constant current 3A (Charge current > 2A, please add heat dissipation) Wiring method: Welding plate IN and : input positive, IN - : input negative (SOLAR) BATand: battery positive, BA-: battery negative Size:45 x 31mm/1.77 x 1.22inch Package Included: 1 x MPPT Solar Panel Controller Package List Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.