As Christmas approaches so does the obligation of delighting your children, grandkids or yourself with a present that will give great joy. If a Segway is beyond your budgets and the garage is already full of bicycles, a hoverboard must be worth a shot. Or is it? These devices are now widely available at affordable prices, on eBay for instance. So we dismantled one and checked it out to discover precisely what lies ‘under the hood’.