Gro-Egg Room Thermometer. Peace of mind at a glance - the innovative Gro-egg changes color 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. As an added bonus it even works well as a gentle night light. A yellow glow suggests a comfortable temperature for children to sleep in, while a blue glow suggests it's too cold and a red glow suggests it's too warm. The colors act as a reminder for you to cool or heat the room, to modify the baby's clothing, to use a different tog Grobag Baby Sleep Bag or for non-sleep bag users to alter the level of bedding. Digital thermometer with permanent 'back-lit' LCD readout. Gentle night light. Instructions and safe sleep information enclosed. When the Gro-Egg glows yellow your room is at a comfortable temperature. A blue glow suggests it's too cold. A red glow suggests it's too warm. Also use as a gentle night light. Also available are . . . Orla The Owl, Percy The Penguin & Mikey The Monkey - A Fun accessory that sits on top of your Gro-egg (sold separately). Surface clean only.