American amp company Fender has teamed up with German audio manufacturer Teufel on the Rockster Cross, a large, loud, wearable Bluetooth speaker. Like boomboxes of yore, this is meant to be toted aroundbut slung from one's shoulder, rather than hoisted on it. There's an included Fender guitar strap, and the rear side of the speaker has a curve in it to correspond with the human body.Image: TechTesters Image: HiFi The 30-watt speaker features two tweeters, a woofer and two passive radiators. Audio reviewers say the thing can be cranked without suffering the distortion common with other Bluetooth speakers. It's got an IPX5 water resistance rating. The massive battery provides 16 hours of runtime, with the trade-off being that the speaker weighs nearly 9 pounds.These run $200.