The RS-WMB and RD-WMB series of room sensors and displays are designed for mounting on a standard electrical back box. They include a temperature sensor with versions which also include humidity and CO2 sensors. The RD-WMB has a monochrome backlit LCD display with setpoint, override, and fan speed control.
They are designed to operate with Trend IQ4 and IQeco controllers. They connect to the controller by a two wire polarity independent wall bus which carries both data and power.