Description: Features: brand new and high quality. The first use needs to be activated by charging with 12V power supply Without 18650 battery,You need to prepare 3x 18650 batteries yourself to use. for DC 5.5x2.1mm interface input or output functions,with for DC adapter and power switch,weasy to use. for DC 5.5x2.1mm port for 12V LED Light WiFi Router for smart Speaker or more devices. Lithium battery for protection circuit, overcharge, low voltage, overload, short circuit for protection Specification: Material:Plastic+metal Color:Black Input Voltage:DC 12V Output Voltage: for DC 12V Positive inside, negative outside Size:9.3x6.6x2.7cm 18650 Batteries are not Included Note Please put in battery in a right way. Packing list: 1x 18650 battery box for case.