Soundrop straps

In Japan you can find those soundrop straps in gashapon (machines where you insert coins to get random goodies).
Basically when you press the button, a sound or phrase voice will leave from the strap. I remember the time i arrived in Japan and saw one of these gashapon for the first time, I spend lots of money trying to get all the collection, and many times in the end went to home whit various repeated straps without complete the series... lucky you can sell then in some recycle stores but the price what he will pay is very low compared on what you spent...
Here some videos what I uploaded:

You can buy straps from Amazon .co.jp Soundrops