Features: The battery voltage must matching the solar panel voltage and power. The working voltage and power of the LED with output termination must correspond to the battery voltage. Features: charging during the day, automatically turning on the light at night, and automatically turning off the light Scope of application: landscape light, courtyard light, small street light, colorful strings. Connection method: 1.B+ B_ connection lithium cell 2.S+S- connection solar panel 3. L+L- connection output. Multiple protection functions: built-in multiple protection mechanisms such as overcharge, overdischarge and short circuit to ensure the safe operation of the equipment. Specifications: Component:PCB Size:Approx.78x18mm/3.07x0.7inch Package Includes: 10Pcs Controller Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.