Measurement Object: Wall-Mounted Boiler Opening Size: 86x86x13 (Front) + 27 (Rear) Mm Overall Dimensions: 86x86x13 (Front) + 27 (Rear) Mm (Mm) Control Type: Temperature Temperature Range: 5℃-60℃ Installation Type: Wall Opening Control Mode: Intelligent Temperature Control Regulator Temperature Measurement Error: 1℃ Working Voltage: AC 95-220V 50/60Hz Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Shipped without 3 AA batteries Colour:White Material:ABS Package Contents: 1 x Battery Tester Relay Analyzer 2 x 18650 Battery 1 x Charger Base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 2. Battery Powered, Requires 3AA Batteries, No Separate AC Power Supply Required, Easy To Install 4. Manual Mode/Program Mode/Temporary Program Mode 5. Programming Function, 5+2/6+1/ A Week, 6 Periods On Working Days, 2 Periods On Rest Days, Supports Different Temperature Settings And Runs As Planned. 3. App Remote Control, Smart Life/Tuya App Remote Control Anytime And Anywhere 1. Low Power Consumption Thermostat, Dedicated To Water And Gas Boilers Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.