EASY TO GET STARTED: No ON/OFF button, for the first time just to press any button of backside or put it in the water, it will be waken up and start to work, you will get an accurate and stable water reading within 1 minute.EXCELLENT QUALITY: Made from single piece BPA free gentle plastic with a built-in sealed battery, all thermometers are IPX7 waterproof rated, and have been tested and inspected strictly before leaving our own factory. They are certificated by 3rd party lab that are compliance to ASTMF963, CE and UKCA, meet all relevant safety norms making them suitable for use as both bathtub thermometer and toy perfect even for your babies or toddlers.MULTI-PURPOSE: Your thermometer can easily to be used to measure the temperature of your bathtub or child's bedroom. Its stable design means unlike some other designs it's less likely to flip over and misread the temperature as it floats.PEACE OF MIND: As a parent knowing your baby is safe and healthy is the most important thing. Your Bath and Room Thermometer removes all guesswork providing accurate and reliable water and air temperatures quickly, ensuring you are never in doubt that your bathtub or nursery is not too hot or cold. Its red LED warning light flashes if the temperature is too hot and it also has messages on the display too for extra reassurance.TWO TEMPERATURE MODES: The thermometer can display in both Fahrenheit and Celsius degree. At least 150hours battery lifespan to let you avoid the trouble of constantly changing the battery.