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Absolutely none.
The quality is really terrible! After using it for about three years, things often break down, and when I ask why, they can't explain the cause. They only say, "Electronic products are all like this."
I asked other professionals, and they said it normally shouldn't malfunction so often. So I really, really recommend not using it unless there's absolutely no alternative—or unless you have a lot of money!
This is the first time I've ever left a negative review, and it's for this elevator! I'm really pissed off. It's so, so, so, so, so, so terrible!