If you’re still using the tinny speakers on your phone or tablet, please stop. Nobody should have to suffer like that. For just a few bucks, you can get a good Bluetooth speaker that offers bigger and better sound out of your mobile device. In addition, some speakers include such extras as a speakerphone, water resistance and daylong battery life.

There are a lot of speakers available for less than $40, so we headed to Amazon and bought and tested more than a dozen to find the best ones. Our evaluations were based on design, sound quality, ease of use and special features. Here are our top picks.