The B-Band phantom power is a small external box that uses a standard 9-volt battery to power any of B-Band preamp except the A2. With the use of a standard 1/4" TRS to TRS (stereo to stereo) plug type cable, the battery box can send power to the onboard preamp. If you do not want to have a battery in your guitar, the preamp can be phantom powered be the B-Box. The battery box has a standard 1/4" output jack for cable connection to a mixer or amplifier.