Feature:1. 1A 3.2-18.5V multi-function battery charger with photovoltaic cell MPPT function. 2. Complete charge controller for single or multi-cell lithium battery. 3. The maximum load current/current output is 1A, you can change the current by changing the value of the Rcs resistor. 4. When the battery is absent, it can be used as a voltage source. 5. Automatic charging, battery overvoltage protection. Specification: Item Type: MPPT Solar Panel Controller Module Input Voltage: DC 12-28V Output Voltage: DC 1.2-11V Adjustable (3.6V 4.2V 4.3V 4.35V 8.4V) 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) Led Indicator:"" LED is charge status indicator Temperature: -40~85 Application: 1. 18V 12V 9V Solar Battery Charging 2. Car Battery Charging 3. Mobile Loadspeaker 4. Electric Bicycle Charger 5. UPS 6. Portable Industrial and Equipment 7. Handheld Equipment 8. Emergency Lamp and Camping Lamp 9. Battery- System 10. Standalone Chargers for Lithium , or Lithium Titanate Batteries : ABS colour: green Package Contents: 1 x Solar Panel Charge Controller Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.