Features Digital monitor: real time measurement of actual temperature and humidity. Convenient to get indoor and outdoor temperature and humidity over time. Wireless Transmitter: This hygrometer is equipped with a wireless transmitter, with strong wireless signal penetration (frequency 433MHz), and the open transmission distance is 100 meters, the effective transmission distance is 30 meters. Wide measuring range: the indoor temperature range is 0‑60℃/32‑140℉, the outdoor temperature range is ‑40℃‑60℃/‑40℉‑140℉; the humidity range is 10%-99%. Data is automatically updated every 60 seconds, which allows the sensor to stabilize for an approximation Convenient adjustment: Easily change the temperature unit to ℃ or ℉ with the top button. Please note that before installing the battery in the device, please change the ℃/℉ unit and the default setting is ℃. Powered by 2 AAA batteries. Flexible Application - Designed with wall mount and retractable bracket on the back, it can be easily installed on the wall or table. Widely used in children's rooms, bedrooms, homes, nurseries, basements, warehouses and greenhouses. Specification: Item Type: Digital Thermometer Hygrometer Material: ABS plastic Display screen size: approx. 75 x 60 x 22 mm/3 x 2.4 x 0.9 inches Transmitter size: approx. 75 x 55 x 25 mm/3 x 2.2 x 1 inch Display Screen Power Supply: 2 x AAA batteries (not included). Transmitter Power: 2 x AAA batteries (not included) Open transmission distance: approx. 100 meters/328.1 feet Effective transmission distance: approx. 30 meters/98.4 feet Frequency: 433MHz Refresh rate: 60 seconds Temperature range: Indoor 0-60℃ (error: ±1℃), External -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 Package List 1 x Display Screen 1 x Transmitter 1 x User Manual