Feature: 1. Adopt industrial grade master chip, large screen LCD display, charge and discharge parameters adjustable 2. Built in overflow short circuit protection, open circuit protection, reverse protection, all self recovery, no damage controller 3. Complete 3 stage PWM charging management, dual MOS anti pushing circuit, ultra low heat generation 4. Good quality, durable, can be used for a long time, bring a lot of convenience 5. More convenient to use and easy to operate, easy to carry, easy to take, easy to use Specification: Item Type: Battery Solar Controller Material: ABS Rated Charging Current: 10A , 20A , 30A Rated Discharge Current: 10A Battery Type: B1 = Lead Acid Battery 12V ,24V Battery Automatic Identification B2 = Lithium Ion Battery (Lithium Battery) 3 String 3.7V = 11.1V B3 = Lithium Iron Phosphate Battery 4 String 3.2V to 12.8V Discharge Upper Up: 10.7V (B1) 9V (B2) 10V (B3) Light Control Open Light Valve Value: Photovoltaic Plate 8V(Optical Control Light is Delayed) Optical Control Switch Valve Value: Photovoltaic Plate 8V (Optical Control Light is Delayed) Usb Output: 2 Way USB Output, 5V , 2.5A (Maximum) Stope Current: <10mA Work Temperature: -35 ~ + 60 ℃. Package List: 1 x Battery Solar Controller1 x User Manual Note: