DigiFi has launched its Opera wireless earphones in the United States market. 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 so
