Guitar/bass amp with internal battery.

In addition to the instrument input, the MGB 100 and MGB 150 amplifier models feature an additional input for connecting a dynamic microphone, as well as a VHF receiver (including hand-held microphone), AUX input and a USB/SD/BT interface for playing external files. They also incorporate an internal ECHO with level control. 2 tone controls and internal battery. This battery can be charged using the external power supply which allows the amplifier to be operated either mains powered using this power supply or using the internal battery.