Features: Can install 6x 18650 batteries (batteries are not included). Provides extra backup power for all devices supporting USB charging. Dual USB output design, can charge 2 devices simultaneously. Plug and Play, output power using the USB port, easy to use. Type-C and Micro USB dual input modes, convenient to use. Note: 1. Welding-free, just buy 18650 batteries yourself and install on your own. 2. Never oppositely place the two poles of the batteries, otherwise it will damage the motherboard. 3. The shell can not be disassembled twice, please get it done once. 4. The digital display screen is not a real one.