Davy the dog is a sleep trainer, clock and night light that teaches kids when it's time to go to sleep and get up. Davy closes his eyes when it's bedtime and opens them back when it's OK to get up. The screen changes color at night or day and the 12 stars disappear 1 after 1 to count down the time remaining before getting up. Davy also helps with clock reading, both analog and digital. Built-in alarm clock, variable brightness and timer function. Works with USB (cable included) and on batteries (4 x AA - not included).