Product Description The M48 48V phantom power supply allows you to use your devices and microphones that require external power in any setup. Sometimes the phantom power being supplied is inadequate as well and with the M48 you will always get a clean full 48V of power for the best sound and noise performance. Powered by either a 9V battery or supplied AC adapter. From the manufacturer Mackie M48 Phantom Power Supply The M48 48v Phantom Power Supply allows you to use your devices and microphones that require external power in any setup. Clean & Full 48V of Power Sometimes the phantom power being supplied is inadequate as well and with the M48 you will always get a clean full 48v of power for the best sound and noise performance. Key Features Perfect for condenser mics and equipment that require 48v Phantom Power. XLR input and output Transparent noise-free operation Powered by the included AC adapter or 9v battery Power and Low Battery indication Built-Like-A-Tank construction