["brand new and high quality Features: The first for time you need to install the 18650 flat for head battery,then press the button on the back of the circuit board to activate the use of this product. 5.5x2.1mm port output is for DC 12V,Suitable for wifi Router LED Strip Security Camera and more. As USB mobile charger for cellphone tablet and more devices,with for DC adapter,easy to use. With overcharge, overdischarge, overload, short circuit and other for protection. Specifications: Item Type: 18650 Li-ion Battery Charger Box Material: Plastic Color: Back Size: 9.5x12.5x2.7cm input: for DC 12V-13V 5.5x2.1mm port output: for DC 12V 3-5A USB Output: 5V 2A Package includes: 1 X DIY Power Bank Box(18650 batteries are not included) 1 X for DC adapter"]