The Wheelock Eluxa 4X/3R weatherproof series EL3RMTST/EL4XMTST Multi-Tone colored lens strobe appliances are designed for easy installation with a pre-wire capable EL4XBB surface box or EL3RMP mounting plate. Eluxa 4X/3R Multi-Tone Strobe (Blue, Green or Red) is UL Certified under Standard UL1638 for Visual Signaling Devices and Standard 464 for Audible Signaling Devices. The Eluxa 4X/3R Multi-Tone is also ULC Listed under Standard ULC526 for Visual Signaling Devices and under Standard ULC525 for Audible Signaling Devices for Fire Alarm Systems. All models are listed for indoor/outdoor use, and for wall or ceiling mount.