Universal DIY 3x 18650 Battery Case Box 12V Mobile UPS Power Supply Charger for LED Light WiFi Router and moreOOTDTY  Description:Features:brand new and high quality.The first use needs to be activated by charging with 12V power supplyWithout 18650 battery,You need to prepare 3x 18650 batteries yourself to use.DC 5.5x2.1mm interface input or output functions,with DC adapter and power switch,weasy to use.DC 5.5x2.1mm port for 12V LED Light WiFi Router smart Speaker or more devices.Lithium battery protection circuit, overcharge, low voltage, overload, short circuit protectionSpecification:Material:Plastic+metalColor:BlackInput Voltage:DC 12VOutput Voltage: DC 12V Positive inside, negative outsideSize:9.3x6.6x2.7cm18650 Batteries are not IncludedNotePlease put in battery in a right way.Packing list:1x 18650 battery box case.