This is a great tool. It is a rechargeable Ott Light. You can charge the light in your cabin and then bring the charged light to your class. Unfortunately, there won't be sufficient outlets in the conference room if too many guests bring corded lights. I know Costco sold them last year. If you have one, please bring it along. You will want to pack it in your checked-in (luggage) bag and not your carry on, and inform Donna if you are bringing one of these lights on the cruise ship. Royal Caribbean wants to know if passengers are bringing "odd" items aboard the ship. I think most people (non stampers, of course) would think this light is an odd item.