Night Switch. The NS-1 is a simple on-off toggle switch mounted in a convenient plastic case. The NS-1 can be used with Viking products that have a Night Switch input or any product that requires an external switch closure. The compact design and foam mounting tape make it easy to install the NS-1 almost anywhere - right next to the equipment in a phone closet or remotely at a front desk. The NS-1 has 24in wires and comes with two quick connectors. Applications Use as a Night Switch for the following Viking products: CPA-7B DVA-TNT FXI-1 PA-2A PA-30 PI-1A RAD-AMP SA-25 TMS-12A ZPI-4 Use as a Trigger Input for the following Viking products: BLK-3-EWP CTG-1 CTG-2 C-250 DNA-510 K-202-DVA K-2000-DVA MTG-10 PF-6A RC-3 SC-911 SLP-1 SLP-4 VR-1B Features Compact size, mounts anywhere Rugged switch with flat actuator Foam tape for quick mounting Quick connectors for easy wiring.