The NXG Technology NX-SS4 is a 4-zone automatic impedance matching speaker selector designed for use with multiple brands, including NXG. It allows you to connect up to four pairs of speakers and switch between them, distributing audio to different zones in your home. The black device is compatible with the NXG Technology NX-SS4 model and is ideal for use in home audio systems.

Brand new. I opened the box to take photos only.

Power handling: 100 watts RMS per channel

Removable screw type connectors accept 14-gauge wire

Automatic impedance protection circuitry

Frequency response: 20Hz-22kHz

Includes room labeling system

11 1/2'' W x 1 7/8'' H x 7'' D; weight: 3 lbs.