Touchmaster™ Delta
The Touchmaster™ Delta, model UTMD siren produces five distinctive Unitrol siren sounds: Wail, Manual Wail, Yelp, Futura and Ultra Hi-Lo and also allows for light control through six push-button relay switches located on the unit’s face panel. The principal light and siren-controlling device on the Touchmaster Delta is the rugged and time-tested 60 amperes (progressive) slide switch, which allows the Delta’s total system switching capacity to reach 180 amperes.
Additional Features
Additional features include; SWEEP, Park Siren Deactivation, Air Horn sound, Alarm, Radio/PA, TEST and advanced ACP (Automatic Component Protection). Special features also available with the Touchmaster Delta include; eight-second shot gun timer delay and dual tone capability.
The Touchmaster Delta offers Override (O/R) or SWEEP features created to improve effective traffic management at potentially dangerous intersections. Through horn ring activation, (or user supplied manual switch) the siren operator has the option of continuously cycling through three siren tones at six second intervals for eight seconds before a second touch to the horn ring that returns the unit to its original tone setting.
Other important Delta features include Alarm – a special non-siren tone that can warn the operator if the vehicle is being tampered with or of high inside vehicle temperature if K-9’s are involved; TEST – depressing the TEST switch will send a short siren tone burst through the vehicle’s speaker to insure proper siren operation; ACP – with Automatic Component Protection, the siren continually checks for short-circuits between the amplifier and the speaker.
Auxiliary Functions/Lighting
The Touchmaster™ Delta delivers solid light and siren control through the siren’s four-position slide switch and six 20 amperes push-button switches. Well known for its ruggedness and reliability, the Delta slide switch offers three 20 amperes (progressive) switch positions for a total of 60 amperes. LED indicators advise as to which slide switch position is activated. The six backlit and rubberized push button accessory switches provide 20 amperes of auxiliary switching at each switch location. The five left switches are latching (push once to activate, press a second time to de-activate) and the sixth switch is a momentary type.

Models for every need
Standard models are available, from either a basic toggle switch to a slide-bar for complete warning equipment control. Optional features may be specified for maximum customization.

PA/Air Horn-Only System

Touchmaster model UTMPA6 is available for applications where a siren is not needed. This unit provides you with Public Address, air horn sound, slide-bar control, and four on/off switches.

Automatic Component Protection (ACP®)

By constantly checking for short-circuits, Automatic Component Protection (ACP) stops damage to Touchmaster sirens should a speaker fail. Remove the short and operation returns to normal—no need to replace fuses, output transistors, or reset the siren.

SWEEP and LOCK Modes

The following special features are built into the Touchmaster siren: SWEEP mode makes the siren warning more noticeable by cycling through each of three sounds in six second intervals. The LOCK mode also speeds siren sound changes. With the siren activated, LOCK changes WAIL to continuous Yelp and HI-LO to continuous Hetro® until the original sound is restored with a tap of the horn ring. With Park Siren Deactivation, all siren sound is shut off automatically when the vehicle is shifted into Park, but all warning lights and PA/Radio functions remain active. (Order model UPKM-3 for Park Siren Deactivation)

Additional Features

All Touchmaster models allow broadcast of two-way radio messages over the loudspeaker. (An optional mic adapter feature allows the radio microphone to be used for public address.) During non-pursuit conditions, the BYPASS switch allows the operator to use the siren without activating the warning lights.


Touchmaster units are designed for quick and easy installation. Mounting brackets, if ordered, are available to allow the siren to slide out after just a couple turns of the screws. All connections are individually labeled for identification, making installation a snap.


Input Voltage 11-16 VDC
Standby Current 0A
Operating Current Siren - 0-180A
Amplifier - 7.5A (one 100W speaker)
Amplifier - 14.0A (two 100W speakers)
Operating Temperature Range -30˚ C to 65˚ C
Frequency Range 500 Hz to 1650 Hz
Nominal Cycle Range Wail – 11 cycles per min., Yelp – 240 cycles per min.
Nominal Voltage Output 64V peak-to-peak (siren tones)
Audio Frequency Response 300 Hz to 3,000 Hz (+/- 3 dB)
Input Impedance 4,000 ohms (nominal)
Current Ratings Slide-bar outputs (progressive), Position 1 – 20A, Position 2 – 20A, Position 3 – 20A, Progressive Total – 60A and Accessory switches – 20A each
Dim. (H x W x D) 2.4 in (6.2 cm) x 6.5 in (16.5 cm) x 5.4 in (13.8 cm)
Ship Weight 5.0 lbs (2.3 kg)5 lb


Audible Equipment may produce LOUD sounds necessary to request the right-of-way. Audible equipment may cause hearing damage. Wear hearing protection. Refer to the Installation Manual or call 800/433-9132 for further instructions.

Important Warning for Police Boats and Fire Rescue Boats

It has come to our attention that police boat and fire rescue boat sirens and speakers may subject persons operating those craft to sound pressure levels that can cause permanent hearing loss. We recommend that speakers be located as far forward on the boat as possible, as recommended in the SAE Recommended Practice J1849 "Emergency Vehicle Sirens". However, unprotected exposures of a sufficient duration to properly located siren speakers can still create a risk of hearing loss.

It is our recommendation that your siren speakers should be relocated and persons operating these craft should wear hearing protection when using the siren system.

Failure to comply with these recommendations may result in temporary or permanent hearing loss to operators and passengers of these vehicles.