I had a whistle activated key ring like this over 25 yrs ago and it worked perfectly so I don't understand why this one should be so poor. It is far too sensitive and beeps at almost every noise. My first car journey with it attached to my keyring was absolute hell. It beeped along with every song on the radio and I'm afraid it went straight into the bin when I arrived home!
My only problem with this is that it arrived in an ordinary envelope with no plastic bag. The envelope was battered when it arrived so a bag would have been sensible. As it happens it was fine. The t-shirt itself is great. Decent quality and a real bargain.
For all those looking to engage their boys in reading,I can't recommend this highly enough. Not that it's just for boys, far from it, my daughter has breezed through the series but i know that getting boys to read is an issue so for all those space loving kids out there, this is a must.