DigiFi has launched its Opera wireless earphones in the United States.The system, previously only available in Korea, features Kleer wireless technology that is claimed transmit uncompressed CD-quality audio over the 2.4GHz band, with a frequency range of 20Hz to 20KHz and an 86dB signal to noise ratio. Users can connect the transmitter to any iPod, PMP, or laptop, without requiring any software installation. Up to four Kleer-enabled receivers can be simultaneously connected to the same source and the battery life is claimed to reach 10 hours. You can snag the earphones right now in your choice of black or white for just under $100.