Behringer Ultra-G GI100 Professional Battery/Phantom Powered DI-Box with Guitar Speaker Emulation Professional and multi-purpose direct injection box for stage and studio applications Authentic 4 x 12" speaker emulation by renowned amp designer Jurgen Rath Provides impedance and signal matching for the direct connection of instruments to mixers and amplifiers Ultra-flat frequency response due to renowned BEHRINGER OT-1 transformer Internal battery automatically shuts off when phantom power is applied