Product features: 1. Suitable for solar green light, solar light boxes advertising board, solar lights, housing solar power generation system, marine solar power generation system, outdoor survival solar power generation system 2. 12V 24V automatic intelligent solar charge and discharge controller.3. With buttons, digital display, automatic memory function. 4. With a complete 4-level PWM charge management function.5. Built-in short circuit protection, open circuit protection, reverse polarity protection, overload protection. 6. Using dual MOSFET reverse current protection, less heat.7. Anti- Features: 18V20W solar panel plus 12V / 24V solar controller set 1: Solar panel parameters Material: Class A polycrystalline solar panel Maximum power: 20W Maximum voltage: 21V Working voltage: 18V Current: 0-1000MA 2: Solar controller parameters Product Name: LCD LCD Solar Controller Current: 50A Voltage: DC 12V / 24V Display: LCD screen Consuming: 10MA Micro-dual USB output: 5V / 2A (mobile phone charging charging, etc.) Colour: Black Material: plastic + polysilicon Package Contents: 1* solar panel 1* controller 1* English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.