Hard-Wired 24VDC Audio/Visual Doorbell System Kit with Selectable Strobe Colors & Audible Tones

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Includes 5 selectable strobe colors & 5 selectable audible tones....the first of its kind !


The HW-LDHSK2 Kit is a 24 volt DC doorbell system designed for apartments, hotel rooms and other areas designed to assist those with audible, visual, or physical impairments. The kit consists of one combination horn/strobe (audible & visual), one power supply and one single gang backlight doorbell push button plate. Each visual appliance strobe strength can be field adjusted to obtain 5 different colors. The horn signal has switch selection for 5 different sound outputs.

Each signal is provided with a multi-color strobe, rotary switch SW1 and SW2 for the horn.

SW1 parameters: 0=Strobe OFF, 1=Amber/Yellow Strobe, 2=Clear/White Strobe, 3=Green Strobe, 4=Blue Strobe, 5=Red Strobe.

SW2 parameters: 0=Horn OFF, 1=Chime Continuous, 2=Chime Temporal pattern, 3=Horn Continuous, 4=Horn Temporal pattern, 5=Doorbell/Ding Dong.

The switching power supply can power up to 5 additional horn/strobes. The power supply is rated for 1.0Amp at 24VDC, but you should always use the “80% rule” when sizing the power consumption needs, which means don’t account for more than .80Amp.

The notification mounting bracket can be mounted universally to single gang, double gang, 4 square, and many more boxes.

Unit dimensions: 5” (12.7 cm) high x 5.0” (12.7 cm) wide x 2.0” (5.08 cm) deep.


Features / Specs


• Notification appliances meet ANSI/UL 464, ANSI/UL 1971, and UL 1638.

• 24VDC power supply rated for 1.0A, 110/220VAC input, =/- 15%

• The power supply includes an enclosure

• The power supply operating temperature range is -20 ~ +70°C

• The doorbell is mounted on a single gang SS plate with flying leads on the back

• White backlight push button

• Field selectable strobe lens colors: amber, clear, blue, green and red

• Field selectable audible sound output: chime continuous, chime temporal, horn continuous, horn temporal, or doorbell tone (ding dong)

• Input terminals accept 14 to 18 AWG wire

• Nominal voltage 24VDC

• Unit Dimensions: 5” (12.7 cm) high x 5.0” (12.7 cm) wide x 2.0” (5.08 cm) deep

• Product compliance with NFPA 72, IBC/IFC/IRC


If needed, additional 24VDC horn/strobe units for other rooms/locations can be ordered with a kit.


Our (optional) doorbell timer relay can adjust the length of the strobe flash of your hard-wired doorbell system from 3 to 60 seconds. 


* NOTE: This kit must be installed by a licensed electrician



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  • 5

    Posted by Joe on 21st Dec 2021

    Works as advertised

  • 5
    Great product

    Posted by Mikes Electric on 27th Jun 2020

    Excellent system and easy installation for any electrician. I like the way you can adjust the strobe's brightness and the sound of the audio. Highly recommended for any commercial or residential environment.