Features: Strong output capability of 20V/5A, meeting high-speed charging and discharging needs and improving usage efficiency Built in intelligent boost circuit, compatible with multiple voltage input and output scenarios, and adaptable to various devices Bi directional charging and discharging of lithium batteries, suitable for applications such as mobile power banks and energy storage systems Intelligent recognition device requirements, safe and efficient matching of charging current and voltage Accurately match the working voltage range of the battery to ensure charging and discharging safety and battery life Specifications: Material: Plastic + Metal Size: 4.0*4.0*1.5cm Color: As Shown In The Picture Type C interface: PD100W 20V5A USB port: SCP22.5W 4.5V5A, 18W/20W 9V2A Electricity percentage display Interface current and voltage display Attentions: 1. Do not perform live welding, which means that when welding the+- two wires of the motherboard, these two wires are not powered, which can avoid 99.99% of unexpected situations. 2. The motherboard only has+-, and if it is soldered with power on, it may shake and burn easily. Please turn off the power and solder it first. Connect the motherboard+- first. The negative electrode of the battery pack is finally welded!!! The two wires on the motherboard cannot balance the battery, and the balance protection function is on the lithium battery protection board. 3. The first power on may not display the battery level correctly, but it will return to normal after cycling. 4. The default capacity of a single 500mah may vary greatly, but the battery display may not be accurate. It does not affect other functions and there is no need to worry about overcharging or discharging. Package Included: 1 x Module Note: 1. Please note that the photo does not show actual size please refer to Description for size details. 2. Please allow differences due to manual measurement thanks. 3. Due to the difference between different monitors the image may not reflect the actual color of the item.