Compatibility This control switch is compatible with a variety of battery voltages and provides charging and control options for batteries, including 2 V, 3.7 V, 4 V, 11.1 V and 12 V. Efficient charging and control Automatically charges the battery during the day and powers the lights at night. It also turns the lights off at dawn and adjusts the output voltage based on voltage changes generated by the solar panel, reducing the need for extra components. Materials and durability Made from high quality materials, this control switch delivers long durability and reliable performance, ensuring longevity. Easy to use and portable Simple design for ease of use and portability, offering convenient operation for a range of applications. Use scenarios - Off grid solar lighting for gardens or walkways that requires automatic day night operation and reliable battery management. - Remote cabins, RVs, or boats where simple battery charging and automatic lighting control improve convenience and reduce maintenance. - Small solar powered devices or sign lighting that benefit from automatic charging during the day and automatic on off lighting at night.