This product can be used to keep the power bank powered on, testing power bank consumption and chargers. It can also be used as a load to draw current, preventing the power bank from shutting down due to insufficient current draw. Most power banks automatically shut down after tens to several minutes when they detect no or very low current draw, similar to when a phone is fully charged or unplugged. This module maintains a certain level of current draw to keep the power bank powered on. This product uses a USB-A port, and the current draw can be adjusted by plugging in jumpers. There are four settings: 25mA, 50mA, 75mA, and 150mA. You can adjust the current draw to your power bank's specific needs. If the power bank can't stay powered on, add another jumper. For example, plugging in the 50mA setting will draw 50mA. If the power bank shuts down, plug in a 25mA or other current drawer until the current draw is sufficient to keep it powered on. The maximum current draw is 150mA + 75mA + 50mA + 25mA = 300mA. Color: As Shown Material: plastic Package Contents: 1 x Anti-shutdown module