Bluetooth speakers are super-handy when you want to listen to music while you're out and about. Unfortunately, most Bluetooth speakers are just little blocks of easy-to-destroy plastic. If you're looking for something heftier, Instructables user ASCAS shows us how to build a rugged Bluetooth speaker.
This project is pretty complicated, but the end result is a Bluetooth speaker that looks like it can survive a good beating. It's packed inside a watertight container, comes with its own remote, and has a solid 2.1 channel audio system. You'll need basic soldering skills, a little knowledge of electronics and some patience to build this, but the guide is easy to follow.
DIY Tough Bluetooth Speaker [Instructables]