Smoke CO detectors for M1XRF2Hv2 › M1 Support Forum › Smoke CO detectors for M1XRF2Hv2 This topic has 3 replies, 2 voices, and was last updated February 2, 2026 at 8:03 am by Brad Weeks. Viewing 4 posts - 1 through 4 (of 4 total) Author Posts January 30, 2026 at 2:59 pm #9905 Jason Roberts Which smoke and CO detectors are compatible with ELK Expander M1XRF2Hv2 January 30, 2026 at 4:46 pm #9907 Brad Weeks The Honeywell 5800 COMBO IS NOT compatible with the M1 system but the individual Smoke only (5808W3) or CO only (5800 CO) should work. We are currently evaluating the new 5800CMBOV but testing isn’t complete at this time. January 30, 2026 at 5:22 pm #9908 Jason Roberts Just to clarify – it is the 5800COV This link February 2, 2026 at 8:03 am #9913 Brad Weeks Yes, the 5800 COV should be compatible with the M1XRF2H receiver and the M1 Gold. Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In