1、APPLICABLE BATTERY: The output is controlled by detecting the change of solar panel voltage, applicable to 3.2V 3.7V 6.4V 7.4V 11.1V 12.8V batteries. 2、ENERGY SAVING: Charging in the daytime, automatic light on and on at night, automatic light off at dawn, greatly saving energy and electricity. 3、WIDE APPLICATION: The solar control panel is applicable to solar lawn lamps, landscape lamps, garden lamps, corridor lamps, DIY street lamps, etc. 4、4PCS IN 1 SET: Including 4pcs solar lamp controller modules, with good compatibility, sufficient quantity for easy use and replacement. 5、COMPACT SIZE: These solar lamp control boards have compact size, convenient installation and use, stable performance and less interference.