Honeywell CM927 CMS927 CMS927B1049 Wireless Room Thermostat - REPLACEMENT UNIT
CM927, CMS927, CMS927B1049. This thermostat uses the 868MHz 'Ramses 2' RF protocol, so can easily replace existing Honeywell CM Series Wireless Thermostats (simply binds to existing Honeywell BDR91 Wireless Relay Boxes).