Double claw design, double layer stable, thick and durable. Because the 925 silver is soft, it is easy to break the pendant buckle if it is over pulled. Material Silver, Sterling Silver. They can cause silver jewelry dim or even black.
It works, well made.
Improvements,
1) Cable should be smaller or flat. That would make getting it into a freezer easier (or out a window).
2) Typical embedded product. Way too hard to program, not obvious at all.
Other than that it has been working fine for 6 months now.