General description Measuring indoor and outdoor temperature and humidity, this weather station alarm clock features Celsius and Fahrenheit conversion, maximum and minimum humidity memory function, and the ability to view historical temperature and humidity data. It can connect up to three outdoor units and includes a high sensitivity touch key control for easy operation. The device has a large HD color LCD display with backlight, which automatically turns off after 10 seconds of inactivity. Technical specifications Indoor temperature range: -4°F to 158°F (-20°C to 70°C) Outdoor temperature range: -40°F to 158°F (-40°C to 70°C) Humidity range: 20% to 95% Temperature display unit: °C/°F (default is °C) Temperature resolution: 0.1°C/°F Humidity resolution: 1% Refresh rate: 10 seconds Error: temperature ±1°C, humidity ±5% Wireless reception range: 60m/197ft RF radio frequency: 433 MHz Power supply: Host 2xAAA (not included); Transmitter 1xAAA (not included) Color: White Material: Plastic