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3 inches. Hands down Lyric is the best DIY home security system today. The Lyric system controller is backward compatible with the earlier Honeywell 5800 Series wireless sensors and detectors allowing upgrade customers to reuse existing devices on the new platform. Likewise, the new SiX Series line of wireless devices are easy to install, easy to maintain
and provide a higher level of security. This includes the Lyric secondary keypad LKP500 EN, Lyric Keyfob SiXFOB, Lyric Door Window Contact SiXminiCT, Lyric Motion Sensor SiXPIR, Lyric Glassbreak SiXGB, Lyric Smoke Detector SiXSMOKE, and Lyric Auxiliary Siren SiXSIREN. The series
utilize a 2.