Controller: 1. Use industrial grade master chip. 2. Large-screen LCD display, adjustable charging and discharging parameters, with power-off memory function. 3. Complete 3-stage PWM charge management. 4. Built-in overcurrent, short circuit protection, open circuit protection, reverse connection protection, all self-recovery type, does not damage the controller. 5. Dual USB output, maximum current up to 25A. Support mobile phone charging. 6. Double MOS anti-backflow circuit, ultra low heat. Specification: Condition: 100% Brand New Material: ABS Color: As picture shown Maximum power (Pmax): 20w Open circuit voltage (Voc): 20v Short circuit current (Isc): 1.5A Maximum power voltage (Vmp): 18v Maximum power current (Imp): 1.1A STC (standard test conditions): 1000W / square meter, AM = 1.5, 25 °C Maximum system voltage: 1000V Output: USB 5V and DC 18V Size: 435*200*2.5mm/17.1*7.9*0.1in System voltage: 12V/24V adaptive Rated charging current: 10A Rated discharge current: 10A Maximum PV voltage: up to 23V for 12V batteries. At 24V, the maximum is 46V. Floating charge voltage: adjustable at 13.7V Discharge cut-off voltage: 10.7V adjustable Discharge recovery voltage: 12.6V adjustable Charging recovery voltage: 13V USB output: 2 USB outputs, 5V/2.5A maximum Standby current: <10mA Package List: 1 * Solar panel 1 * Tiger clip 4 * Suction cups 1 * Car charger 1 * Instruction Manual 1 * Solar Controller