Niles SSVC-4 Speaker Selector, Black Power Handling: 100 Watts Per Channel RMS; 200 Watts Peak. Separate left and right ground paths for compatibility with all amplifiers Selectable Impedance Magnification For 1, 2, 3/4, 5/6 Pairs Of Speakers Individual Room On/off Selector Switches 12-step Controls; 54dB Maximum Attenuation 10 year limited Accommodates 4 pairs of speakers Power handling - 100 watts per channel RMS; 200 watts peak Selectable impedance magnification for individual speaker pairs Individual room On/Off selector switches 12-step controls; 54dB maximum attenuation