Probably the smallest device on the market, these powerful little devices pack a big punch with a 500mAh battery, 3 voltage settings, (3.2V, 3.6V, and 4.0V), A digital display, and USB Type-C charging port.

Each of these devices has an easy-to-use single-button action that turns on and off the device with 5 clicks, can change the voltage, and is pressed when consuming.