The high-quality indoor thermostat is made of high-quality plastic material, so this mechanical temperature controller is environmentally friendly, safe, and durable. You can rest assured to purchase our constant temperature switch. Easy to use indoor temperature controller, easy to control the system through the on/off switch on the left side of the temperature controller, and your room temperature is easy to adjust with a temperature switch of 10-30. The mechanical temperature controller is suitable for controlling central air conditioning in hotels, restaurants, supermarkets, or homes. The working principle of our room temperature controller is to control the opening/closing of valves and fans in the fan coil unit. White size: 8.8 x 8.8 x 5 cm Sales quantity: 1 piece Control type: Temperature control method: Mechanical temperature controller Measurement object: Room temperature range: 10-30 Temperature measurement error: 1. Installation type: Wall output signal: 10 (mA) Working voltage: 220 (V) Regarding color difference: The products sold are all physical items, but due to different lighting, displays, etc., there may be some color difference. This is a normal phenomenon, not a quality issue. Regarding size: The dimensions of the products sold are all manually measured. Due to different measurement methods and tools, an error of 1-2mm may occur, which is normal Package includes: 1 * Temperature controller Attention: Due to manual measurement, please allow for a slight error. Please make sure you dont mind before bidding 2. Colors may vary depending on the monitor, please understand Attention: Hello, please pay attention to your shipping address when purchasing products. If your delivery information (such as name, street, house number, doorbell/email without name, etc.) is incorrect, the order will not be delivered correctly.