7 Day programming, 4 programs per day. Adjustable cyle rate. Pre-programmed. Easy front load battery access. Energy and filter use monitors. Up-opening door. Daylight Savings key. Temporary and vacation overrides. Programmable hold. Home today override. Two-stage low battery warning with fail safe protection. Compatible with most: single-stage heat pumps Terminations: G, RC, RH,Y/O, W/B, Y1. 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. 3 year warranty.