The Pyle Pro PDC22 is an unpowered Dual Direct DI box. It converts unbalanced signals to balanced signals andbalanced to unbalanced. It also features a parallel out in order to loop a signal back. The DI also has a -0dB, -20dB and -40dB which allows you to connect higher powered connection to it to send via balanced out like amp speaker outs etc. It also features a ground lift. It is of full metal construction and in my tests noiseless. It does exactly what it is requested to do.