Ambient Weather WS-42 Wireless with Indoor Temperature and Floating Pool and Spa Thermometer Wireless indoor and outdoor temperature, made simple Simply insert batteries in the base and remote unit, and install the sensor in the pool or spa The pool and spa temperature is transmitted to the display console inside The display is simple and easy to read. The remote includes mounting hole for hanging outside or on a wall The F007PF wireless pool and spa thermometer is water proof and floats on the surface of the water