1. Low Power Consumption Thermostat, Dedicated To Water And Gas Boilers 2. Battery Powered, Requires 3AA Batteries, No Separate AC Power Supply Required, Easy To Install 3. App Remote Control, Smart Life/Tuya App Remote Control Anytime And Anywhere 4. Manual Mode/Program Mode/Temporary Program Mode 5. Programming Function, 5+2/6+1/7 Days A Week, 6 Periods On Working Days, 2 Periods On Rest Days, Supports Different Temperature Settings And Runs As Planned. 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.