Rapco Horizon LTIGLBLOX Miniature Laptop Interface with Ground LiftLTIGLBLOX is a consumer to pro interface. It converts input from consumer grade equipment (laptop computers, MP3 players, CD players) to a mic level balanced output. Ground lift switch. Gives operator volume control of the outgoing stereo signal. 3. 5mm male input and XLR male output. Features: Self contained unit converts input from consumer grade equipment to a mic level balanced output Operator volume control of outgoing stereo signal 3. 5mm male