Philips SBT30ORG/37

The grenade-size ; has an eye-catching design, streams music wirelessly over Bluetooth, and delivers much bigger sound than its size would indicate. It features speakerphone capabilities and its built-in rechargeable gives you about 8 hours of sound.

No volume control on the speaker. It also distorts at higher volumes and can't handle big bass that well.

The Philips SoundShooter Wireless has a sharp design and is one of the better-sounding sub-$50 tiny Bluetooth speakers -- and it has speakerphone capabilities to boot.