Super Waterproof: With its IP68 waterproof rating, the bath thermometer is perfect for use in swimming pools, hot tubs, pools, bathtubs, ponds, and more. Smart Remote Control: The digital pool thermometer is equipped with a 433 RF radio transmitter that has an effective range of up to 50 meters and in an open environment up to 80-120 meters. Accurate Temperature Measurement: The water thermometer can accurately measure both indoors (0-50°C) and outdoors (-40-70°C). Smart Display: The bathtub thermometer is equipped with an electronic screen that displays the time and temperature in real time and indicates low battery level, making it more convenient for you to use. Easy to use: the sensor requires 2 AA LR6 batteries and the display batteries require 2 AAA LR03 batteries. After inserting the batteries, simply place the sensor where you want to measure the temperature, then you can read the display.