This thermostat is made of quality material, durable and safe to use. It is easy to install and convenient to use. Features children lock function to prevent from misoperation and data memory fuction when there is power failure. Features: It uses high reliability single chip which has excellent performance and strong anti-interference ability. Children lock protection for preventing kids from misoperation.Data memory function when there is power failure.Holiday mode allows you enjoy a more comfortable temperature when go home from holiday.Easy to operate, You can also use the button on the thermostat to set different working modes. Specification: Condition: 100% Brand New Material: ABS, Plastic Color: White Power Supply: 2*AA Battery(not included) Power: <0.3W   Load Current: 3A(Water Heating) Temperature Diaplay Range: 0- 70°C Working Temperature: 1- 70°C Accuracy: ±0.5℃ Set-point Temperature Range: 5℃- 35℃  Output: Switch Relay Probe Sensor: NTC（10K）1% Contact Capacity: 5A Boiler Heating Running Program: Set per 1 week as a cycle Size: approx. 8.6*8.6*2.9cm/3.39*3.39*1.14in Weight: approx. 170g/6oz Package List: 1 * Thermostat(Battery Not Included) Note: 1. Please allow 1-3cm error due to manual measurement, thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object, please take the real one as standard. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering Features High Quality Material:This thermostat is made of high quality material, durable and safe to use. It is easy to install and convenient to use. It uses a highly reliable single chip with excellent performance and strong anti-interference ability. Digital thermostat for gas boiler and underfloor heating:The gas boiler thermostat is used to control boilers that adjust the temperature by starting or stopping operation. The thermostat detects the room temperature, when the actual room temperature is lower than the set temperature, the thermostat will control the boiler to start working. Then the thermostat controls the boiler to stop operating when the actual room temperature is higher than the set temperature. Weekly Schedule Selection:Supports manual setting of 5+2, 6+1 and 7 days weekly schedule for option, bringing you maximum convenience for different situations. Data storage when the device is turned off. Vacation days and temperature can be set to work in countdown mode and enjoy a more comfortable temperature on vacation. White Backlight with Child Lock:Digital Room Thermostat easy operation even at night. Contribute to environmental protection by saving energy with 2*AA batteries. It is equipped with two sections of AA batteries and a contact capacity of 5A. Easy to Read:Wall Thermostat easy to read digital Celsius temperature display. Features a child lock function to protect against mishandling and a data storage function in the event of a power outage. Vacation mode allows you to enjoy a more comfortable temperature when you return from vacation. Easy to use, you can also use the thermostat button to set different operating modes.