Compatibility and battery types Compatible with 3.2V, 3.7V, 4V, 11*11*24, 11.1V and 12V lithium batteries. Efficient charging and control The switch circuit automatically charges the battery from solar input during daylight and activates connected lights at night by detecting voltage changes from the solar panel. It eliminates the need for photosensitive components while providing reliable dusktodawn operation. Durable outdoor performance Built with robust materials and circuitry, this solar controller offers lasting functionality under outdoor conditions, delivering stable power management for lowpower applications in changing weather. Easy installation and use Compact green design with a straightforward wiring layout makes the circuit switch module simple to connect and deploy. It is convenient for DIY solar projects and portable solutions while traveling. Use scenarios Garden and lawn lighting: suitable for garden lights, lawn lights, and string lights along pathways, as well as small outdoor lighting installations. Small streetlight systems: appropriate for compact streetlight setups and similar lowpower outdoor deployments. Portable or travel projects: suitable for DIY solar projects and portable setups where a simple, reliable dusktodawn controller is needed.