The Wheelock MT multitone horns and horn strobes offer a choice of eight (8) nationally and internationally recognized alerting sounds: Horn, Bell, March Time Horn, Code-3 Tone, Code-3 Horn, Slow Whoop, Siren or Hi/Lo Tone. The Code-3 Horn and tone patterns are engineered to comply with NFPA/ANSI Temporal Pattern specifications without requiring additional equipment. With MT horns and horn strobes, one alarm appliance meets most of your signaling needs. The MT strobes can be synchronized using the Wheelock DSM Sync Modules, Wheelock Power Supplies or other manufacturers panel incorporating the Wheelock Patented Sync Protocol. The MT's Code 3 Horn may be sychronized with the same equipment. The MT Strobes are designed for ADA applications while meeting or exceeding the latest requirements of NFPA 72, ANSI 117.1, UFC and UL Standard 1971 as well as meeting ADA requirements concerning photosensitive epilepsy. Each MT appliance has two installer selective sound output levels: STANDARD dBA and HIGH dBA.Non-strobe versions provide selectable voltage capability in one unit, 12VDC or 24VDC. Strobe versions are specific for either 12VDC or 24VDC and all models may be used with filtered or unfiltered (full-wave-rectified) input voltages.Separate input terminals and shunt wires are provided to enable both audible and strobe to operate simultaneously from a single input. The MT multitone strobe appliances are UL listed for indoor wall mount applications under Standard 1971 for Signaling Devices for the Hearing Impaired and under Standard 464 for Audible Signaling Appliances. The MT horn strobe are also ULC listed under ULC-S525 Audible Signaling Devices for Fire Alarm and Signaling Systems, including Accessories and ULC-S526 Visible Signal Devices, Fire Alarm and Signaling Systems, including Accessories.