The sensor broadcasts the temperature to the monitor from up to 100' (30M) away (in an open area) via a wireless RF signal
The monitor displays either the local or remote temperatures in °C or °F
Each monitor comes with 1 temperature sensor with bench stand and wall mount and batteries (2 x AA + 2 x AAA) which last about 1 year

Technical Details

Size (LWH): 2.95 inches, 0.98 inches, 4.53 inches
Product Details
Product Dimensions: 2.95 x 0.98 x 4.53 inches
Package Dimensions: 5 x 3 x 1.5 inches
Shipping Weight: 0.3 pounds (View shipping rates and policies)
ASIN : B00N5IT5ZK