Wireless Weather Station, Sensor Temperature Range -40 Degrees to 158 Degrees F/-40 Degrees to 70 Degrees C, 1 Percent to 99 Percent, Number of Sensors 3, Transmission Range 330 ft, Primary Scale Outdoor Humidity/Temperature, Base Power Source Details (3) AA Batteries, Base Temperature Range 32 Degrees to 122 Degrees F/0 Degrees to 50 Degrees C, 3 1/4 in H X 3 5/8 in W 2-Digit LCD Display - 3/4 in Digit Height, 5.4 in W x 5 in H (Base)/1.6 in W x 4.8 in H x 0.9 in D (Sensor) This complete indoor/outdoor environment monitoring system features the ability to measure temperature and humidity in four locations in and around your office or facility. Offering premium digital thermometers and hygrometers, it lets you view at-a-glance information to keep your workplace comfortable, while protecting your valuable inventory, ingredients, or materials.