Utilizing a radio wave signal, the remote sensor will measure the temperature at the waterproof probe tip and send the information to the display monitor, which will display the temperature in F or C degrees. The thermometer can accept a maximum of 4 remote sensors thus expanding the monitoring capability to 4 different locations to be displayed on the same monitor. This unit includes 1 remote sensor. Specifications: requires two AAA batteries Size: Wireless Thermometer: 2" h x 3 1/4" l x 3/4" w Display Monitor: 5" l x 2 1/2" h x 3/4" w Warranty: The Wireless Thermometer is warranted to be free of defects in material and workmanship for a period of 2 years from date of sales.The Wireless Remote Sensor is warranted to be free of defects in material and workmanship for a period of 30 days from the date of sale.