Appearance(1) Standard total Size is 86*86mm(6) Display size : 64*64mm(2) Back light color: White/Blue(3) The visible thickness above the wall is only 15mm(4) 86mm hidden box and 60mm European box(5) Flat mounting,it is easy to installFunctions(A) Product sensor is built-in sensor(B) 0.5 °C accuracy keeps temperature within the level you set.(C)children lock to prevent children from misoperation.(D) Data memory when power is off.(ELHoliday mode make you enjoy a more comfortable temperature when go home from holiday.(F ) The temperature of external sensor can be checkedProduct Specifications Power: 2 AA 1.5V alkaline batteriess Display.accoracyss 0.5°C7 Probe sensor::: NTC(10kJ1% Contact capacity-e 3 A Boiler heatings Working environment temperatures: 0-9o°C Range of temperature adjustment:: 5~35°CRange of temperature display:: 0~40°C17 Insulating condition: Normal environment1 Running program: Set per 1 week as a cycleOutput: Switch relay1 Installation: Wall mounted or on battery seatSize(mm): 86*86*27 Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some difference color, depending on the physical item received.