Includes four AAA batteries for the sensor and base Temperature ranges between -20°C (-4°F) and 50°C (122°F). Includes 12/24hr format, indoor/outdoor thermometer display in °C/°F which is lit up on an LCD screen. 433.92mhz transmitter frequency with a range of up to 60m/200ft. 0.875" D x 2.375" W x 3.5" H