The Zoom Power Ohm offers the perfect solution for power as it incorporates both a power bank and AC adaptor into one piece. Simply open the prongs and use the style as an AC adaptor. This can be used either with the base or without the base. The Ohm will charge itself while plugged into a wall outlet with the base attached. Unplug with a full charge and the base offers a power bank with 3000 mAh at an output speed of 1 Amp. Power supply can be monitored by pressing the power button at the bottom of the device. This product has passed ETL or UL standards.