Features:The first you need to install the 18650 flat for 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 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 BoxMaterial: PCColor: BlackSize: 9.5x12.5x2.7cmInput: DC12V-13V5.5x2.1mm Port Output: DC12V 3-5AUSB Output: 5V 2ADue to different product batches, the appearance , which will not affect the usePackage Contents:1X DIY Box1X AdapterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.