Features UPS(uninterrupted power supply), it will charge the battery and no use the battery power, if power failure, it will automatically use the battery power. The five-in-one board is a four-in-one heavy upgrade version. Add the balance charging function, the load capacity is enhanced (normally 12 W) Battery protection board, lithium battery protection, charging management protection, keep you safe. The module still has the function of seamless switching between power supply and battery.Power failure or unplugging power does not flash off or restart. High efficiency boost with load 2W, double cell series balance charger. Specification:Conditon: 100% Brand New Item Type: Lithium Battery Step Up Module Material: Synthesis BoardColor: As Pictures ShownPower Supply: DC12V/9V Current: 0.9-1A Battery Connection: Double section in seriesBattery Model: 18650 Lithium Battery(Not Included) Package List:1 x Lithium Battery Step Up Module Note:The battery is not included. Package List 1 x Lithium Battery Step Up Module