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.