Còi Hơi Cổ Vũ (Stadium Air Horn)

Blow horn, blow in the small hole and the sound will be amazing. WC approved.

Assembly required: the two large pieces fit like a glove, the smaller ring is to keep nonsticking packaging plastic in place. i find the best way to do this is to keep the plastic tight around the opening and force the ring over it. once its on there tight test by blowing in the small hole if the pressure is to high losen the ring slightly. there should be some pressure but a kid should be able to blow it. 

Note: I used a sturdy packaging plastic from gloves i suppose the transparent plastic they use to wrap flowers should be fine.

once you hear a horn sound, try blowing it as hard as you can.