Honeywell DT92E - Getting Started with the ST9420 C Programmer: Initial Setup; Step 1: Setting the Date and Time

Switch ON/OFF (frost protection enabled)
Pressing the green ECO button gives a timed period at a different, predefined
temperature
DT92 WIRELESS DIGITAL ROOM THERMOSTAT2 09/15 SPECIFICATIONS
ELECTRICAL
Room thermostat Power supply : 2 x 1.5V IEC LR6 (AA) Alkaline cells Battery life :