Through modern history portable audio devices have gone through many evolutionary phases from boom boxes and Walkman cassette tape players to CD and MP3 players. Now listening to music on the go consists of carrying around a smartphone and headphones, or a Bluetooth speaker. However some Bluetooth speakers are too large to easily fit in a bag with other items. The bēm wireless mobile speaker was designed to fit where others wouldn't, and MacNN has one to give away to our readers.