Specifications: Remote temperature range: -40 degF to +149 degF Indoor temperature range: 32 degF to +140 degF Temperature accuracy: +/-2.0 degF Console Dimensions (LxWxH): 3.5 x 2.5 x 0.6 Inch 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.