This DIY power bank kit supports up to 22.5W fast charging, allowing your compatible phones and devices to recharge quickly and efficiently. Ideal for users who need rapid power replenishment during travel, commuting, or daily use. Compact and lightweight, the mini portable body fits easily into pockets, bags, or backpacks without adding bulk. Perfect as a backup charger for business trips, vacations, outdoor activities, and everyday carry. Supports USB and USB-C input/output (specific ports depend on the selected model), compatible with smartphones, tablets, Bluetooth earphones, smartwatches, handheld game consoles, and other USB-powered devices. Ideal for both Android and iOS ecosystems. Built-in intelligent protection system helps protect your devices and batteries from overcharge, over-discharge, overcurrent, short circuit, and overheating. Stable output and safe charging extend the lifespan of your electronics and battery cells. The kit is designed for convenient assembly. Simply insert the 21700 cells according to the positive and negative markings, close the case, and you have a functional power bank. Suitable for DIY enthusiasts, electronics hobbyists, and users who want a customizable power solution. Color: As Shown Material: plastic Package Contents: 1*motherboard Only 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.