It works great, Keeps time like it should. Perfect for any metal surface you need a clock on. I couldn't find much on this clock but I thought it might have been designed for the haul of a metal ship. I really don't know, but I do know that it's been on my fridge with my grandkids opening and slamming the fridge door constantly and the clock never budges. It does have a hook on the top to hang it on a wall if you prefer. It's just a very neat clock. Battery powered, just a single AA. It's about 5 1/2 inches from side to side.