Not recommended in its current mechanical design.
Complex engineering, good engineering. But: The mechanical version of the lifejacket holder is a smooth 6! Even cheaper is not possible. After you find nothing in the attached description for handling, you have to come up with the idea, to look at You Tube ... Usually you have on the boat no permanent Internet reception ... In a few words and pictures can be without More complete the manual, right? If you have the device in use (with the belt buckle attached to the life jacket), then the device falls out at the latest on the first maneuver on deck. With luck only to the deck, with pitch right into the water to the bottom. It is a rescue device! We had two units on our tour to Iceland, luckily nobody went overboard. But the holder and belt buckle is so primitive, so that both devices fell down on first use. In the case of one device, then the locking pin is also broken. Just imagine, you're in the water and when you use the device falls out of the holder and thus immediately on the bottom of the respective sea ... For a decent holder, I would also beireit, 5 € to pay more. Greetings, OS