Uses radio transmission circuitry and coding technology to solve the problem of signal interference or blocking Different temperature modes selectable, Compatible with Alexasuitable for different scenarios, easy to adjust to your needs The data signals are transmitted wirelessly, you can remotely monitor it via your mobile phone and it supports temperature control via the Tuya app Powered by 3 x AA batteries, low power consumption, with long battery life Equipped with a prompt function for low voltage monitoring, so you can change the batteries in time Product Features: Uses radio transmission circuitry and coding technology to solve the problem of signal interference or blocking. Different temperature modes selectable, suitable for different scenarios, easy to adjust to your needs. The data signals are transmitted wirelessly, you can remotely monitor it via your mobile phone and it supports temperature control via the Tuya app. Powered by 3 x AA batteries, low power consumption, with long battery life. Equipped with a prompt function for low voltage monitoring, so you can change the batteries in time. Equipped with alarm function, it automatically sends online reports to your phone if the temperature is too high/low, or if humidity is too high / too low. Professional anti-disassembly design. Split design with high reliability. Specifications: Name: Temperature sensor. Material: ABS (acrylonitrile butadiene). Communication method: WiFi. Wi-Fi standard: 802.11b/g/n. Channels: 1-14 @ 2.4 GHz. Power supply: DC 4.5 V (3 x AA battery, not included). Communication distance: 70 metres (unobstructed). Installation method: Desktop Placement. Temperature: -10C to 55C. Humidity: 0 - 100% RH (relative humidity). Size of item: 64 x 64 x 28 mm / 2.52 x 2.52 x 1.10 inches. Boxed size: 68 x 68 mm x 50 mm / 2.68 x 2.68 x 1.97 inches. Package weight: 160 g. Box contents: 1 x temperature sensor.