Niles Audio CS12V Current Sensing 12V Trigger. Used. Good. Works.

Niles SVL-6 6-Zone Speaker Selector Switch Volume Control System

Niles CS12V Current Sensing 12V Trigger Delay AC Outlet US Plug Black 12VDC NEW

Niles Audio SVL‑2 Speaker Selector Volume Control Box System Tested Made in USA

Niles Audio SPS-6 Speaker Selector 6-Zone Impedance Match Protection Switch

Vintage NILES AUDIO SPS-1 SPEAKER SELECTOR & Protection Circuit

Niles Audio High Definition Speaker Selection System HDS-6 Tested Working

NILES AUDIO APC-2 CURRENT SENSING AC OUTLET SWITCHER