Honeywell Equipment Remote Module With Thermostat, 24 V, 50/60 Hz Frequency, Programmability: Programmable, Changeover: Auto, Manual, Battery, Hardwired Power Source, Up to 2 Heat/2 Cool Conventional, Up to 2 Heat/2 Cool Heat Pump Stages, Touch Screen Display, -40 to 155 deg F Compressor, 30 to 130 deg F Boiler, 0 to 99% RH Humidity, Horizontal Mounting, Terminal Designation: C, D, ERM-J, L, O/B, R, S1, S1, Y, Y2, Dimensions: 6-39/64 in H x 6-7/8 in W x 1-31/64 in D, Additional Information: For Use With Condensing Unit/Compressor or Boiler and RedLINK⢠Thermostats