The LiftMaster LMH24R plain red horn provides an audible warning to enhance safety around commercial door and gate systems. This 2‑wire device automatically senses 12‑ or 24‑volt DC power and produces an intense 88+ dBA output, helping to alert pedestrians when a door is opening or closing. A rotary switch allows selection of horn tone and volume, while the durable red housing mounts easily to an indoor wall and withstands operating temperatures from 32°F to 120°F. Use it to meet safety and code requirements in applications requiring clear audible notification.
Features & Compatibility:
- Auto‑sensing 12/24 V DC input for flexible installation
- Adjustable horn tone and two volume settings via rotary switch
- Loud 88+ dBA output at 16 V
- Wall‑mount design with dimensions 5.6 × 3.46 × 1.91 inches
- Operating voltage range 8–17.5 V (12 V nominal) or 16–33 V (24 V nominal)
- Compatible with LiftMaster fire door operators, horn strobes and notification systems
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