Features 1、Digital Monitor: Real time measurement of actual temperature and humidity. Convenient to get the indoor and outdoor temperature and humidity in time. 2、Wireless Transmitter: This hygrometer is equipped with a wireless transmitter, with strong wireless signal penetration (433MHz frequency), and the open transmission distance is 100 meters, the effective transmission distance is 30 meters. 3、Wide Measuring Range: Indoor temperature range is 0‑60℃/32‑140℉, the outdoor temperature range is ‑40℃‑60℃/‑40℉‑140℉; the humidity range is 10%‑99%. The data is automatically refreshed every 60 seconds, which allows the sensor to stabilize for approximately 30 minutes. 4、Convenient Adjusting: Easily switch the temperature unit to ℃ or ℉ with the button on the top. Please note that before installing the battery in the device, please switch the ℃/℉ unit, and the default is ℃. Powered by 2 x AAA battery. 5、Flexible Application: Designed with wall hanging and retractable bracket at the back, can be easily installed on the wall or on the table. Widely used in baby rooms, bedrooms, homes, nurseries, basements, warehouses and greenhouses. Specification Item Type: Digital Hygrometer Thermometer Material: ABS Plastic Display Screen Size: Approx. 75 x 60 x 22mm / 3 x 2.4 x 0.9in Transmitter size: Approx. 75 x 55 x 25mm / 3 x 2.2 x 1in Display Screen Power Supply: 2 x AAA battery (not included). Transmitter Power Supply: 2 x AAA battery (not included). Open Transmission Distance: Approx. 100meter / 328.1ft Effective Transmission Distance: Approx. 30meter / 98.4ft Frequency: 433MHz Update Frequency: 60S Temperature Range: Indoor 0-60 ℃ (error: ±1℃), outdoor -40-60 ℃ (error: ±1℃). Humidity Range: Indoor 10%-99% RH (error ±5%RH), outdoor 10%-99% RH (error ±5%RH). Package List 1 x Display Screen 1 x Transmitter 1 x User Manual