kokkia conferencing_speaker : wireless bluetooth speaker for softphone, mobile phone. for use in audio conferencing via voip softphone and mobile phone.Best sound quality and 360-degree high-sensitivity omni-directional microphone enables everyone to hear and be heard from all angles across Conferencing_Speaker. Can be used for listening to multimedia music with crystal clear clarity. Specifications: - Microphone sensitivity : -38dB - 2*3W speaker output - Frequency Response : 80Hz - 20kHz - SNR >= 85dB - Talk Time : Up to 5 hours. Music Play Time : Up to 8 hours at 80% volume. Standby Time : Up to 300 hours. - Dimensions : Diameter 8.7" (220mm) X Height 2.1" (53mm) - Weight : 9.50z (270g) Includes : - Conferencing Speaker - USB cable - User guide