We tested the Motorola Rokr S9 HD headset with the Apple iPhone 3G and the Casio Exilim C721. The Rokr S9 HD comes with SRS-WOW HD sound that really amps up the overall fidelity of the music. You can choose between two SRS-WOW HD settings: one has fuller sound with more clarity, and another has balanced audio with enhanced bass. Music quality was quite spectacular as a result; the bass sounded round and full, and we were impressed with the surround sound qualities of the high-definition audio.
Call quality was a little less than stellar, but still surprisingly good. We could hear our callers loud and clear without any problems and vice versa. However, callers did detect quite a bit of echo in the background and they said our voices sounded rather harsh and machine-like at times.
We also tested the Rokr S9 HD out while jogging outdoors. The headset bounced up and down a lot, which felt a little uncomfortable and unwieldy. We also found that the Bluetooth connection would cut out every once in a while, especially if we were really jogging at a rapid pace. This happened a lot more when the paired handset was in the pocket, which might've caused a slight antenna interference; we would advise you wear an armband for better connectivity.
Other features of the Rokr S9 HD include support for call waiting and last number redial, plus the ability to transfer calls from the headset to the phone and vice versa. The Rokr S9 HD also has multipoint technology, which means it can connect up to two phones at once.
The Motorola Rokr S9 HD comes with a Motorola D650 iPod adapter, which will add stereo Bluetooth functionality to any iPod via the dock connector. It also comes with a drawstring pouch for the headset. The Rokr S9 HD has a battery life of up to 6 hours talk time and/or playback time.