FocusPRO large-display non-programmable digital thermostat provides electronic control of 24-volt (AC) conventional and heat pump systems or 750-millivolt (mV) heating systems. Large, clear, backlit display is easy to read in various lighting conditions. Available in large screen or standard display. Precise comfort control (+/- 1-¦F) maintains consistent comfort to the highest level of accuracy. Easy-to-change battery door (flip-out) allows for easy replacement without removing or disassembling the thermostat. Stages: 1 heat/1 cool heat pump or conventional. system Dual-powered (battery and/or hardwire).Also known as PRO 5000 or PRO5000