The listing, J & H watch/lighter New In Box—NOT A TOY, NOT FOR PRACTICAL JOkES has ended.
As I said in the description, this is not a toy or an item to be used for practical jokes. It is quite seriously a combination lighter and watch.
The watch is a Quartz movement and uses the very desirable screw-down back. That means you don't need a case knife, wrench, or oyster opener to open it—just a small Philips screwdriver. That also means any gasket can be exchanged as it ages, maintaining the integrity of the back.
The lighter runs on butane, and activated by a trigger on the right side of the watch face. you'll never be without a light, since your apparatus is strapped to your wrist. Lasts a long time between butanw refills, but not quite as long as a regular lighter.