... Carbon Monoxide alarm (carbon monoxide, CO detector) 1.EN50291 Carbon Monoxide alarm with EN50291 (carbon monoxide, CO detector) Main Features: 1.Non-radioactive technology for environmental friendly2.CO ... tamper resist feature5.Inter-connectable up to 40 CO, Heat And/Or Smoke Alarms6.2 color LED ... warning indicator8.Hush/Test button9.Auto-reset when CO clears10.CE, TUV approved, comply with EN50291, ...