This is the second-generation 'smart' touch screen used in Honeywell's classic Universal Stations. For installations using Rel 41x or 43x software, a station with EPDG uses the 1-processor version of this touch screen. Older PDG stations use the 2-processor version of this touch screen. If you intend to use this touch screen on a Universal Station with PDG, please request the 2-processor version on your order.