Built-in Switch: On-board switch allows easy manual control of the light ON/OFF state, suitable for testing, adjustment and daily use. Solar Street Light Controller Panel: Supports typical solar street light working modes, helping to automatically control lighting according to the charging status and environment. Solar Light Controller for DIY Projects: Compact and versatile control panel for solar garden lights, courtyard lights, landscape lights and decorative string lights. Compatible with Arduino Module: Can be used together with Arduino and other microcontroller development boards, ideal for education, experiments and DIY electronics projects. The product contains battery accessories, Please keep the product out of reach of children to avoid accidental ingestion! Color: Green Material: plastic Package Contents: 1*PCBA circuit controller 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.