Jawbone returned to its core Bluetooth headset business Tuesday through the Icon HD and a companion, the Nerd. The headset itself is a subtle upgrade to the Icon with a bigger and more refined speaker that improves audio clarity, especially in noisy environments. The Nerd is its key, Jawbone says: the USB adapter automatically treats the headset as an audio output on a Mac or PC without having to pair up or disrupting the link to a cellphone.
