Wireless Thermometer, Sensor Temperature Range -40 Degrees to 140 Degrees F/-40 Degrees to 60 Degrees C, Number of Sensors 1, Transmission Range 200 ft, Primary Scale Outdoor Temperature, Includes NIST-Traceable Certificate No, Base Power Source Details (2) AAA Batteries, Base Temperature Range -40 Degrees to 140 Degrees F/-40 Degrees to 60 Degrees C, 2 in H x 1 5/8 in W 3-Digit Backlit LCD Display - 1 in Digit Height, 2 3/8 in W x 3 1/2 in H (Base)/1 9/16 in W x 3 5/8 in H x 3/4 in D (Sensor)