Wall Mount CO2 Sensor Kit, Mounting Type: Wall Mounting, Used with 12½ - 25 Ton Packaged Units (T/YS*150-300; T/YH*150-300; WS*150-240), Kits: 1 - CO2 Demand-Controlled Ventilation Wall-Sensor (4190-4100) with Instructions and Mounting Hardware, 1 - Wire Harness with Low Voltage Terminal Board for CO2 and Ventilation Override, 2 #8-32 Screws for mounting LTB, 1 - Conversion plug 5P6, 1 - “CO2 Kit Has Been Installed” Label, Weight: 1lbs