The Motorola S9 Bluetooth Active Headphones are clearly designed for a Bluetooth-enabled mobile phone that supports the playing and streaming of stereo music. The convenience of having wireless headphones that double as a headset for phone calls will make Motorola's S9 attractive to users who have compatible mobile phones. The S9 Active Headphones, by their very name, suggest they are built for a person who is physically active and only wants to carry one device. They are made from a rigid plastic that makes them water and sweat resistant. Readers who have a mobile phone that can store music and supports the Bluetooth Advanced Audio Distribution Profile (A2DP) and Audio Video Remote Control Profile (AVRCP) should consider the S9 headphones. The headphones allow you with the touch of a button to switch back and forth between listening to music and answering calls, so you don't even have to stop jogging. Readers who don't have a phone which supports stereo Bluetooth should consider buying one first before shelling out the $100 for the Active Headphones S9. We obtained Motorola's new RAZR maxx Ve mobile phone to properly review the headphones' stereo Bluetooth and call features. We also tested the device with the Motorola RAZR V3c and Sony Ericsson W810i phones. The headphones worked in their full capacity with the RAZR maxx Ve phone, but only the left ear bud of the headphones worked for phone calls with the RAZR V3c or W810i phones. Music came through the S9 headphones with ample sound quality. Mid tones came through the best, but low tones were muffled and high tones were overabundant. The connection between devices was sufficient, although there were several instances of interference. The S9 Bluetooth headphones look good, are lightweight for their size and hang tightly on the head, but because they are not adjustable, the headphones interfere with glasses frames and may not fit people with larger heads or big hair. The Motorola S9 headphones will work with iPods, however the Motorola Bluetooth adapter for iPods is sold separately. To compensate, we attempted to pair Motorola's Bluetooth Active Headphones S9 with a Logitech Bluetooth iPod adapter, but the adapter did not work with Motorola's S9 headphones. The included USB Bluetooth Stereo PC adapter works with a computer running Microsoft Windows, but does not work with Apple's OSX operating systems. When testing the included adapter with a Dell Inspiron PC, the Bluetooth Active Headphones S9 feature buttons did not work properly. Motorola suggests a retail price of $129.99 for its product, but shoppers can buy it for $99.44 or less at my ebay store.