Features:
120 VAC, 60 Hz
2.25" L x 3.33" W x 3.2"  inches
LR44 battery backup (included)
Factory set AUTO DST option takes the hassle out of Daylight Saving Time adjustments
One push, programming override for homeowner convenience
Rated for use in low voltage transformers up to 1200W
An operating temperature range of -40˚ F to 122˚ F (-40˚ C to 50˚ C) for steady
performance in all types of climates