Security alarm cable: PVC insulated stranded bare copper conductors, overall gray PVC jacket with rip cord. Riser-rated (CMR) unshielded 4-conductor 16 AWG cable intended for security systems, intercoms, sound/audio and power-limited controls. Voltage rating 300 V; temperature rating -25C to 75C. Available on 500 ft and 1000 ft reels and as cut-to-length (price per foot / reel pricing available at distributors).