InFocus Corporation Thunder Speakerphone， USB， Bluetooth<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Full duplex capabilities with echo cancellation and noise reduction</li><li>Connect to device via USB cable， 2.5mm audio cable or Bluetooth</li><li>Four microphones and 3-inch speaker driver for full audio coverage in a room up to 600 sq ft (add optional INA-MICPODS for coverage of larger rooms)</li><li>Mute， volume， on-hook， off-hook and Bluetooth controls with multi-color indicator lights</li><li>Cable management for clean wire exit from the side or back; RJ9 connectors for optional external microphones</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31kzAZc6t5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41M5agejsuL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/4109TFD306L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41dzou42xFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41fCrYvRadL.jpg" noproxy>