This brightly coloured clock can be constructed in 10 minutes Not only will it teach your kids how gears and cogs work, it will also help them learn to tell time and its colourful construction will add life to any kids’ bedroom. It is spring-driven so no batteries required – once you’ve finished construction just wind it up and watch the cogs turn and tick away! It will run for over 8 hours with one winding – then your child can reset the time, rewind the clock and away it goes again. A great way to teach kids from ages 6-10 about time and how gears work!