The most accurate way to monitor the pool and spa temperature from inside your house. This digital wireless thermometer has a large, easy to read LCD screen that displays water temps (°F and °C) from pools up to 300' away. Thermometer is water, UV, and chemical-resistant and includes three simple function buttons. Batteries are easily replaced with no tools required. Unit can be free-standing or mounted to a wall. Floating wireless transmitter powered by 3 AAA batteries (included; receiver display unit runs on 3 AAA batteries (not included).