Item Type: MPPT Solar Panel Controller Module_x000D_ Input Voltage: DC 12-28V_x000D_ Output Voltage: DC 1.2-11V Adjustable (3.6V 4.2V 4.3V 4.35V 8.4V)_x000D_ Input DC 7-28V, Output DC 1.2-21V Adjustable (3.6V 4.2V 4.3V 4.35V 8.4V 12.6V 16.8V 21V)_x000D_ Led Indicator: ''CR'' LED is charge status indicator_x000D_ Ambient Temperature: -40 to 85_x000D_ Size: 45x20x15mm / 1.77x0.79x0.59in_x000D_ _x000D_ _x000D_ Application:_x000D_ 18V 12V 9V Solar Battery Charging _x000D_ Car Battery Charging _x000D_ Mobile Loadspeaker _x000D_ Electric Bicycle Charger _x000D_ UPS _x000D_ Portable Industrial and Medical Equipment _x000D_ Hand-Held Equipment_x000D_ Emergency Lamp and Camping Lamp_x000D_ Battery-Backup System_x000D_ Standalone Chargers for Lithium ion, LiFePO4 or Lithium Titanate Batteries 11A 3.2-18.5V multi-function battery charger with photovoltaic cell MPPT function. 2Complete charge controller for single or multi-cell lithium battery. 3The maximum load current/current output is 1A, but you can change the current by changing the value of the Rcs resistor. 4When the battery is absent, it can be used as a voltage source. 5Automatic charging, battery overvoltage protection.1 x MPPT Solar Panel Controller Charge Module