1. Function: digital display with , detachable, welding-free, with anti-reverse connection protection, can charge 21 18650 flat-head batteries, when the -in battery can be used as a bank, the normal version requires a charging cable, wireless fast charging The version does not require a charging cable and can be charged quickly. 2. Hand-made DIY mobile kit, -configured mobile , larger battery capacity and more durable, can better solve your charging problem. 3. Suitable for people with greater charging needs, equipped with 3 charging interface types, for , for ,for Type-C can charge the charging box. 4. With display, let you know the remaining anytime and anywhere, and better charge your mobile phone or other devices. 5. Comes with a lanyard, which is more convenient to carry, allowing you to take it wherever you go. : T21 series with light Battery: 18650 type flat head battery * 21 (free welding) Size: Thickness 62mm Width 84mm Length 170mm (internal dimensions remove a : thickness 55mm width 74mm length 129mm) Parameter : T21- with light: output/input maximum : 5V-3A 9V-2A 12V-1.5A Precautions: 1. The battery cannot be used if outer skin is . 2. Pointed batteries cannot be used, only flat batteries can be used. 3. The positive and negative poles need to be placed and used correctly. 4. Do not or store in a high temperature environment. Colour:black Material: ABS Package Contents: 1x 18650 Bank Case(Batteries not included) Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.