Special features: Bluetooth speakers offer all sorts of features beyond the ability to play audio from Bluetooth-sourced devices.Playback controls: Because you can control the playback from your Bluetooth source device (usually a phone or tablet), we don’t require the speaker itself to have playback controls, but it’s a convenient plus.Bluetooth speakers are often available for as little as $5, but we’ve never found such an inexpensive model to sound good enough to bother using-especially when the speakers built into today’s better phones can play loud enough for light listening.