You inspect the mittens

You decide to focus on the main thing, and start inspecting the mittens. They are made of a very thin material, it looks a lot like latex, but it feels more comfortable. You doubt it could be cut easily, otherwise it wouldn't have been used to fulfill this purpose. The material ends at the thinnest point of your elbows, just behind the cuffs, so you couldn't slip out of them either. At first, you fail to see a lock, but then you recognize a small patch for a fingerprint. This indicates there is only one way to unlock it: and that is by Mr. O’Brian, whenever he feels like it.

Great! You grin with the gag in your mouth. If you are unable to use your hands, your situation is just about the same as it was in the straitjacket. Although you might try getting to Mr. O’Brian, and use his fingers to unlock it. Preferably when he sleeps.