The ring is a normal ring with a small bell like mark on the outer band. When a bell rings out in the area, the ring will vibrate. (This is great for deaf monastic/ scholarly types who need to hear bells to get to prayer/ class).
The ring will also vibrate when it is within a short distance of a bell, even if the bell is "at rest".
Either way, The ring will continue to vibrate until touched with a copper piece.
To be honest with you, I have the same complaint (and thus the same less than stellar vote) about this one. While they can be inspirational and adapted, it wasn't that much useful information. (suggested that Kuseru Satsujin do all of these as one big article... but we have a bunch of little ones). Go to Comment
I feel like I have a rubber stamp for all of these. This most GM's might actually use, but it is pretty common information. So I am a bit torn. Still useful to keep one focused on things. Go to Comment
It is hard to measure this one. My normal, will a google search give me this same information or more, was hard to judge as many of the sites came up in Arabic. This may be spot on or it may be seriously lacking. I don't know. I will need to so some more research or find some better sources.