Whirlwind's top of the line active DI. The Hot Box provides super clean front-end circuitry that delivers frequency response that rivals the priciest direct boxes on the market. With its high impedance input, the Hot Box reveals hidden harmonics from guitars and other instruments. Features include a ground-lift switch and an LED which indicates "ON" status. Operates with two (2) 9 volt batteries (not included) or phantom power.