The Behringer Ultra-DI DI600P is a passive 1-channel direct injection box designed for impedance and signal matching of instruments to mixers. It utilizes an internal Behringer OT-2 transformer for galvanic isolation and signal transfer. Features include a switchable ground lift to eliminate hum loops and a switchable low-pass filter to reduce hiss. The unit features an Inst/Amp switch capable of handling signals from instrument levels up to speaker outputs of 3,000 Watts. The box is housed in a rugged metal casing and features gold-plated XLR and 1/4" connectors. It is a purely passive design, requiring no external power source or batteries.