Theater Solutions TS4D Four Zone Dual Input Speaker Selector Box 4 Pair Speaker Switcher Theater Solutions TS4D four zone dual input passive speaker selector box, connects up to 4 pairs of speakers at 8ohm, one to all zones can be engaged at the same time, screw bolt wire connectors Handles up to 300W RMS per channel, input 2 amp or receiver units, engage input A or B per zone, circuit protection switch, amp or receiver impedance protection, accommodates 14 to 22 gauge wire Dimensions are (H x W x D) 2" x 8.5" x 6", steel housing and rubber feet, passive design, no power required, pre-printed zone labels for easy speaker connection and identification Designed and engineered in the USA, full instructions included, use for home audio systems, whole house audio, business or office audio This listing and price is for 1 speaker selector box