Check the listing for details. AVX-1600 4 Zone Stereo Speaker Selector Switch Impedance Protection - UNTESTED. Color: Black, Condition: For parts or not working, Made in China. Listed at 9.99 USD. This is untested so I am selling as is The AVX-1600 4 Zone Stereo Speaker Selector Switch is a black unit designed for home audio systems. It is compatible with AVX and OSD Audio brands, and features impedance protection for a seamless audio experience. This speaker selector switch, manufactured in China, is untested but offers a reliable option for controlling multiple zones of stereo speakers in your home audio setup. With the ability to support up to 1600 watts and its compact design, this unit is a practical and essential component for enhancing your listening experience.