Feel confident that your child’s room always has the ideal humidity level and help keep their throat and nasal passages hydrated with the Safety 1st Smart Humidifier. Top-fill tank with one-gallon capacity can run uninterrupted for up to 24 hours. Touch display with humidity and temperature indicator allows you to monitor room temperature and humidity level. This humidifier uses the Safety 1st Connected App which is the only app that empowers parents to create the optimal environment, set the mood, monitor and comfort their child—anytime, from anywhere.