You will love this if... You're looking for piece of mind. The innovative Gro-egg 2 changes colour to let you know at a glance whether the temperature of a room is too low, too high or just right, helping you maintain a safe sleeping environment for your baby. A little bit more info... This isn't just any room thermometer, the changing colours act as a reminder for you to cool or heat the room, to modify your baby's clothing, to use a different Grobag Baby Sleep Bag, or alter the level of bedding. A yellow or orange glow on the Gro Egg 2 (sometimes known as the Grobag Egg) suggests a comfortable temperature for children to sleep in, whilst a blue glow suggests it's too cold and a red glow suggests it's too warm. Acts as a gentle night light too! USB powered for taking on your travels. Adjustable brightness (4 levels).