The TR21, TR22, TR23, and TR24 are a family of direct wired wall modules for use with Honeywell Excel 600, 500, 100, and 80 controllers; Excel 10 W7750, W7751A, W7752, and W7753 controllers; W7761 Controller; and Spyder Unitary Controllers. All models have a space temperature sensor. (Please note: a separate sensor does not come with the unit. This product is the module only).Features Models available with user selectable setpoint adjustment dials in Fahrenheit, Celsius and Relative Scales Models available with occupied/unoccupied override (bypass) with LED Models available with 3-position (auto/0/1) or 5-position (auto/0/1/2/3 speed) fan switch LONWORKS network jack on all models except the TR21 and TR21-A models Models available with on board humidity sensor, humidity output: 0-10Vdc, 0-5 Vdc, 4-20ma selectable. Specifications Description: 10 K ohm NTC non-linear Temperature Wall Module (for averaging only) Application: For use only when averaging multiple sensors Sensor Type: Unique 10K ohm non-linear, two 20Ks in parallel Color: White Mounting: Mounted on a standard 2 x 4 inch junction box or on a 60 mm diameter junction box. Operating Humidity Range (% RH): 5 to 95% RH, non-condensing Operating Temperature Range (F): 45 F to 99 F Dimensions (in.): 4 13/16 in. high x 3 in. wide x 7/8 in. deep Used with: Special 10K ohm for use only when averaging multiple sensors, can also be used with T7350, TB8220 Thermostats Also Used With: Spyder, Excel 600, 500, 100, 80 and Excel 10, 15 Series Controllers