This little device is designed to ensure your children brush their teeth and wash their hands effectively and for the correct amount of time. It's also fun for kids and actually makes them want to complete these boring but necessary tasks! The device requires 3 AAA batteries which are not included. The LED indicator glows green when either the tooth or the hand wash button is pressed, it changes to red when the time is up. 2 minutes for teeth brushing and 20 seconds for hand washing, as recommended by dentists and hygienists. This is the first digital timer available and replaces older sand hourglass timer designs. The 2 minute teeth timer is a tried and tested method of encouraging your kids to take toothbrushing seriously.