The MXL AC-410W is a wireless boundary mic, similar to the popular MXL AC-404, utilizing 2.4GHz spread spectrum frequency to transmit secure, clear sound, without any wires. Great for conference rooms and connected classrooms, the AC-410W will pickup audio within 25', in an 180 degree arc with 20' reception to USB-powered receiver unit. sturdy metal construction with convenient mute button for enhanced flexibility and durability.