Features: It is precisely controlled by the Single Chip Microcomputer Program without flipping the switch. Built-in 3.7-4.2V 5000MA power lithium battery, with a discharge rate of 65C and a load capacity of 300A. PCB Circuit board, and copper wire, reliable connection, durable to use. Compact and portable, easy and convenient to carry. With its own charging control module, it charges the battery through the USB port. Specification: Material: PCB, Copper Wire Color: As shown Circuit board Size(LxW): 124 x 80 x 18mm Voltage: 3.7-4.2V Current: 300A Package size: 20*7*5cm Package weight: 360g Package includes: 1 x high-rate power battery 1 x Circuit board 1 x Copper soldering pen (with 10AWG wire) 1 x Insulated heat shrinkable tube 1 x USB charging cable 1 x About 80CM 0.1 x 7mm nickel sheet