Based in equal parts on the designs of the Beats Solo HD and Beats Studio headphones, Monster's new Beats Wireless ($280) is only a little larger than Solo HD, adding Bluetooth 2.1 wireless streaming capabilities, a rechargeable battery pack, and a microphone to the prior on-ear design. Each of the glossy plastic earcup sides has a large "b" logo; the right one includes track, volume, and power buttons above a microphone hole, while the left has a…
