The Wheelock Series 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.

Each MT and MT Strobe appliance has two user selective sound output levels: STANDARD dBA and HIGH dBA. The MT-12/24 provides dual voltage capability in one unit, 12 VDC or 24 VDC operation, filtered or FWR. The MT Strobe Electronic appliances operate with 24 VDC and may be used with filtered or unfiltered (fullwave-rectified) input voltages. Separate input terminals are available and shunt wires are provided to enable both tone and strobe to operate simultaneously from a single input.