Specifications: Remote temperature range: -40°F to +149°F (displays °F only) Indoor temperature range: 32°F to +140°F (displays °F only) Temperature accuracy: +/-2.0°F Console Dimensions (LxWxH): 3.5 x 2.5 x 0.6" Synchronized instant reception Low power consumption (over 2 years battery life for both base station and remote sensor) Power requirements: Base station: 2 x "AAA" alkaline batteries (not included) Sensor : 2 x "AAA" alkaline batteries (not included) Transmission frequency: 433MHz Transmission range: up to 120 feet