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Commercial Wireless Multi-Stage Thermostat 2-Stage Heat / 2-Stage Cool. Similar to P474-1100RF, but with additional commercial features such as unoccupied mode, extra security features, and dry contact switch/external device —a dry contact switch is provided to allow an external device to force the thermostat into Unoccupied Mode. Features: -Wireless remote control -Auto Changeover, 2-Stage Heat & 2-Stage Cool for use with gas/electric systems -Thermostat is completely wireless, receiver can be mounted at unit or at old thermostat's location -Up to 4 thermostats can be used with one receiver -Transmits up to 500 feet, through walls and floors -Transmits at 418 MHz using pulse code modulation - won't interfere with other wireless systems -7 day Programming with 4 periods per day -Transmitter uses two AA Lithium batteries -Deadband adjustable from 2 to 6 degrees for the Auto Mode -All programming stored in non-volatile memory -Thermoglow Electro-luminous Display -Display shows both set and room temperature simultaneously -5 minute compressor time guard and adjustable cycle limit, both overrideable for servicing equipment -Setpoint adjustment range form 45° - 95° F, sensing range from 32° - 99° F 64 house codes -Use in conjunction with receiver, P474-2300REC