I wasn't sure what to expect since the price for this was fairly cheap, but what arrived in the mail was quite worth the dollars spent.

It lights up in multi-colors and has three settings...from fast to medium to slow.  The fast setting might be iffy if you're around people who have issues with seizures (same as with other flashing lights), but you can use the medium or slow in that case.

You could also use this as part of decorating for a party and not just as a necklace.  Being battery operated, you could even use it outside for some event or for Halloween.