Features: The output will be turned off when the load current is continuously less than 50mA. It supports charging and discharging, meet your different requirements. The charging module supports external buttons, connect the button to the K point and the output negative pole, short press to turn on the power display and turn on the 5V output, two short presses in a row will turn off the power display and turn off the 5V output. USB-A female socket welding position is provided on the back of the product, and the female socket can be installed manually. It is suitable for 4.2/4.35V battery. If the charging current drops to 100mA after reaching the final float voltage, the charging cycle will be automatically terminated. Specifications: Material: ABS Size: 24.8x20mm/0.97x0.78in Input voltage range: 5~5.5V Charging cut-off voltage: (4.2V/4.35V) ±0.5% Charging current: 2.4A±5% Boost output voltage: 5~5.15V (wire loss compensation) Boost output current: 2A Boost conversion efficiency: 92.5% (3.6V input, 5V2A output) Quiescent current of the battery: <30uA Package Includes: 1x PCB Board note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.