Feature: 1. [Central AC Thermostat] This central air conditioning thermostat adopts LED panel, allowing for energy saving control, with 485 interface, supporting RTU protocol. 2. [User Friendly Control] The thermostat combines colorful lighted temperature control knob and large touch keys, making it easier to operate. 3. [Thin Control Panel] This wall mounted temperature controller is thin, with a thickness of 12.4mm; Multiple installation positions for easier integration into scenes. 4. [Cool Lighting Effect] The knob features 8 lighting effects, 7 color lights transition with Xmas light mode, adding a cool visual effect to your home. 5. [Versatile Installation] This smart air conditioner thermostat supports 86x86 square or 60mm round box installation, suitable for most installation environments. Specification: Item Type: WiFi Air Conditioner Thermostat Enclosure Material: PC, ABS (Fireproof) Model: BAC-009ELW Power Supply: 24V DC/AC 50-60Hz Fan Relay Ampere Resistor: 5A; Inductance: 3A Valve Relay Ampere Resistor: 3A; Inductance: 1A Sensor: Negative Temperature Coefficient 3950, 10K Setting Temperature Range: 5-35℃ Accuracy: ±1℃ Display Temperature Range: 5-99℃ Ambient Temperature: 0-45℃ Ambient Humidity: 5-95% RH (Non Condensing) Storage Temperature: -5-45℃, Timing Error: <1% Power Consumption: <1.5W Mounting Box: 86 x 86mm Square or 60mm Round Box Wire Terminal: Wire 2 x 1.5mm² or 1 x 2.5mm² IP Rating: IP20 Button: Capacitive Touch Button WiFi: 2.4G WiFi. Package List: 1 x WiFi Air Conditioner Thermostat Note: The product is only suitable for 4 pipe air conditioner.