Telex is the performance and technology brand in computer microphones and headsets. Telex offers a complete line of microphones and headsets for voice applications, including the industry's first full-duplex USB digital audio products. ??The best monaural headphone value in the educational/training field, the 610 also features the durable construction that has become a Telex trademark. Magnetic elements provide good quality sound for most elementary and middle school applications. Snap-fit plug-in allows instant cord replacement.