Built upon the same foundation as its earlier iMuffs MB200 and MB210 series Bluetooth wireless headphones, Wi-Gear's new iMuffs MB220 ($150) is a pair of on-ear headphones with a flexible hard plastic band that wraps around the back of your neck, connecting the foam-covered left and right earpieces together. One earpiece has track and play/pause buttons, power and volume controls, and a mini-USB port for charging. A dongle attaches to the bottom…