Portable wireless speaker offers a full-range music playback in MP3 players and professional telephone conferencing through the high-quality, dual MEMs microphones with impedance matching. DSP with noise and echo cancellation, along with a passive radiator and dual speakers, allow a natural-sounding voice in Bluetooth-paired cell phone conversations. Compact design fits easily in a briefcase. Wireless speaker's rechargeable, extra capacity lithium-ion battery assures hours of uninterrupted conferencing or music. Music playback is enhanced by innovative, audio compression technology?APT-X by CSR?to produce audio quality that is indistinguishable from a wired device.