Gentex GN-503FF Smoke & Carbon Monoxide Alarm, 120V Hardwired Interconnectable Photoelectric w/9V Battery Backup, T3 & T4 Horns, A/C Contacts (918-0021-002) by Gentex at Defy Now. MPN: GN-503FF. Hurry! Limited time offer. Offer valid only while supplies last. The Gentex GN503FF is a single or multiple station combination smoke and carbon monoxide alarm. It's designed for 120V hardwired use and features a 9V battery backup for ensured safety even when power is lost. This Gentex smoke/carbon monoxide alarm features a temporal 3 (T3) audible signal for smoke detection and a temporal 4 (T4) audible signal for carbon monoxide evacuation. This model features a universal mount that can be use for ceiling or wall applications. This Gentex combination smoke
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