acorn top whistle

If you know how to whistle from a acorn cap this is just a sturdier version. This "acorn cap" includes a key ring hole for attaching it to any thing you want. This whistle can go to 100 db+!!! (if u know how) if you dont know how heres a link to learn:

https://www.google.com/?gws_rd=ssl#q=how+to+make+a+whistle+from+an+acorn