Let's face it: the speakers on your phone & laptop aren't loud enough. So grab this KIT & build a Mason Jar Speaker to play tunes from your smartphone & more. BUT WAIT: it's also an electric guitar amplifier! Plug in & bust out those wicked solos. Great first project, you'll have music after 21 solder joints & some simple assembly. Impress your friends with a speaker you built with your own hands!