Made And Supported By Honeywell Resideo: Manufactured and supported providing recognised product backing and technical support Direct Replacement Compatibility: Designed as a replacement for Honeywell CM927 CM921 CM727 CMS727 CMT727 CMS921 CMS927 and older CM721 CMS721 CMS727E1016 CMS927B1049 wireless room thermostat and receiver models Wireless System Requirement: Suitable for wireless Honeywell heating systems using a relay box and on off control not suitable for wired thermostats or OpenTherm only installations Pre Bound And BDR91 Compatible: Supplied pre bound with relay box and can also be bound to Honeywell BDR91 relay box with setup guidance and QR video support 7 Day Programmer Boiler Plus Compliant: 7 day programmer with four time schedules per day intelligent heating control and Boiler Plus compliance to help meet Part L regulations Complete Kit With Memory Retention: Includes wireless thermostat relay box table stand AA batteries and instructions with built in memory retaining programme settings during battery change