Billstone In-Safe Series Watch Winder Safe Billstone In-Safe Series Watch Winder is designed specifically to be placed inside a safe or an enclosed cabinet. If you need to secure your expensive automatic watch within a safe or hide it somewhere, the In-Safe watch winder is the right solution for you. In-Safe 2 and 4 winders come with a Lithium-Ion Battery that lasts long and is rechargeable and does not need to be plugged into an electric socket so that you do not need to drill a hole in your safe to make way for cables. The watch winder is compact and slim and does not have any doors so that it can be easily accessed within a safe.