Honeywell Home BDR91A Wireless Relay Box (BDR91A1000) See photos The Honeywell Home BDR91A Wireless Relay Box (BDR91A1000) is suitable for use with all Honeywell Home wireless thermostats using the Rameses 2 protocol. The BDR91A Wireless Relay box transmits on 868MHz and is used by Honeywell Home wireless thermostats to switch heating and hot water products. When used with Honeywell Home Evohome, the BDR91A is used for operating motorised zone valves, boilers and central heating pumps.
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