Motorola has unveiled the Motorola S9-HD stereo Bluetooth headset, a successor to the Motorola Rokr S9 Bluetooth Active headset from last year. Like the S9, the S9-HD hangs behind the head with the player controls on the side, thus maximizing your freedom of movement while on the treadmill or the track. The S9-HD has a nice bonus though--it now comes with high-definition sound with SRS WOW HD and improved earbuds to block out more noise. It has a rated battery life of six hours of play time and weighs about an ounce overall. Not too sure about the pricing or availability just yet, but this is definitely the upgrade over the S9.