Speaker

Materials
1. Cardboard roll
2. 2 plastic cups
3. mobile/phone.

More details about our product:-
This speaker is made at a low cost, So everyone can
easily make it. All you do is cut two holes into the sides
of two plastic drinking cups and insert a toilet paper or
paper towel tube. The sound is great and your phone
stays upright. Here’s a tip that most sites overlook: cut
holes into the bottoms of the cups, too. The sound
quality is much better. When the phone plays music
outside the tube the sound spreads out all around,
but when you put the phone inside the cardboard
tube the sound is directed down the tube towards the
plastic cups and out from there! The cups focus the
sound waves pointing them in one direction rather
than scattered all around. A megaphone works in a
similar way. When a person speaks normally the sound
scatters immediately, but a megaphone channels the
sound towards the subject instead. This is why people
sometimes cup their hands around their mouth to
shout!