Kleer wireless audio technology since we first gave it a listen back at CES in January 2007. Unfortunately, lackluster products have held back its potential over Bluetooth audio. While DigiFi's Opera headset isn't likely to tip the balance, these headphones are interesting nonetheless. The buds ship with a mini-jack dongle and offer 10 hours of playtime and CD-quality sound. Not bad, but they also allow you to tune in up to 3 additional Opera wearing friends. Silent raves will never be the same. Available today in Korea, worldwide eventually for $98.