The LiftMaster LMHS24R Red Horn Strobe is a dual-function warning device designed to provide both audible and visual alerts for doors, gates, barrier arms, and access control points. Engineered for general signaling, it integrates a bright red strobe with a high-output horn to help alert pedestrians and vehicles when a commercial door or gate is in motion or about to operate. Its 12/24 VDC, 2‑wire design streamlines hookup to LiftMaster gate operators and commercial door openers, and it can also be used as a replacement part or upgrade on systems that offer a compatible DC accessory output.
This horn strobe operates on low-voltage DC power at either 12 or 24 volts and uses a simple two-conductor connection for combined audible/visual activation. It is commonly triggered from an operator’s programmable relay or alert output to signal events such as timer-to-close, pre-start, or active movement. For best results, verify the operator’s available DC output and current capacity, or use a separate listed power source when required. Installation should be performed by a qualified technician who can position the unit for optimal visibility and sound coverage, follow LiftMaster wiring guidelines, and comply with local safety regulations. Ideal for residential, commercial, and industrial applications, the LMHS24R helps enhance awareness around automated entrances while maintaining straightforward integration with LiftMaster systems and other 12/24 VDC-compatible controls.