The COOPER-WHEELOCK-MT4-115-WH-VNS is a silver multitone electronic horn strobe of 15 CD candela that offers a choice of eight alerting sounds: Horn, Bell, March Time Horn, Code-3 Tone, Code-3 Horn, Slow Whoop, Siren or Hi/Lo Tone. One alarm appliance can provide superior sound penetration for various ambient and room conditions with two field selectable sound output levels. Also known as -Wheelock Sig./Cooper Wheelock MT4 115 WH VNS - WH-126143