CTRLZS 2X 21X18650 Battery Case Welding Free Power Bank - with Light 18650 Charge Box Detachable DIY Shell

4. With power display, let you know the remaining power anytime and anywhere, and better charge your mobile phone or other devices. 2. Hand-made DIY mobile power kit, self-configured mobile power, larger battery capacity and more , can better solve your charging problem. 1. Function: digital display with power, detachable, welding-free, with anti-reverse connection protection, can charge 21 18650 flat-head batteries, when the built-in battery can be used as a power bank, the normal version requires a charging cable, wireless fast charging The version does not require a charging cable and can be charged quickly. 3. Suitable for people with greater charging needs, equipped with 3 charging interface types, for Micro, for ,for Type-C can charge the charging box. 5. Comes with a lanyard, which is more convenient to carry, allowing you to take it wherever you go.