The 12 inch speaker has a  Battery, so this speaker is ideal for remote PA where there is no power

Portable, Battery Operated 12″ Full Range

Bluetooth, USB, FM Radio

Wireless VHF Microphone.(Battery not Included)

Bass, Mid and Treble EQ Controls.

Aux Input (RCA and 3.5mm Jack)

External Mic Input and Line XLR Output.

75 Watt RMS.

Battery Duty Cycle – 6 Hour at Max Output.

Specifications:

– 12″ Full Range Battery Operated Mobile Speaker System

– 75 Watt RMS / 150 Watt Program / 300 Watt Peak

– Lightweight and Easy to Carry

– 6 Hours Battery Operation between Charging

– Bluetooth, MP3 (USB and SD Card) Player

– Includes Wireless UHF Microphone

– Base, Mids and Treble EQ

– Mic and Auxiliary Inputs

– Line Output

– Portable with Bluetooth, USB, FM Radio, 6 Hour at Max Output