Hah, a bone-assurance, that sounds worse than what Google Translate could come up with! Pretty awful, and their German site isn't much better either. The product is solid though and quite popular. The "bone-assurance" is a circuit breaker you have to pull after using the device, otherwise it will slowly discharge. If you pull it, then you will surely lose it one day. That's actually the one thing I don't like about it.
I will go and see them at the AERO show and ask about the "bone-assurance" and "urinating boats"
