7 Day programming, 4 programs per day and optional remote sensing. Pre-pregrammed with easy to change presets. Programmable fan. Keyboard lock. Energy and filter use monitors. Patented Home Today temporary override. Temporary and vacation hold overide with programmable hold. Daylight saving key. Tri-lingual English, Spanish, French display. Mechanical low temperature protection. Compatible with most: single-stage heat pumps. Terminations: G, W/B, Y/O,R/C, RC1, RH, Y1. Remote sensor terminations: wireless. Latching relays for system compatibility. Soft touch keypad. Low battery indicator. Indiglo Backlight. Easy, front load battery access. 2 AA batteries included. Are compatible with: 24 VAC heat/cool, Heat only or cool only systems. gas, electric or oil systems, millivolt systems, 2 wire hydronic systems (Not for use with 110/220V systems). Have These Specifications: 20-30 VAC, 50/60 Hz, Current draws 0.1 to 1.5 amps, Temperature set range: 45 - 95 degrees Fahrenheit. Operating differential +/- 1 degrees Fahrenheit. Compressor protection: 4 min. delay on break. Measures 6-1/8" width by 5-1/8" height by 1-1/2" depth, 3 year warranty.