VENSTAR P374-0432 EZ THERMOSTAT PROGRAMMER COMPATIBLE WITH:P374-1700, P374-1800, P374-1900, P374-2700, P374-2800, P374-2900 FEATURES:BACK-UP BATTERY, STORES DATA FROM MULTIPLE MODELS SIMULTANEOUSLY INCLUDES:BATTERY DIMS:3-1/8"H X 1-1/2"W X 1"D