Great for Audio/Visual Labs, Assisted Listening Systems and more that have a Mono jack for non-stereo use Go wireless and enjoy the music you love with the Spare CS540 headset In-ear earphones for comfortable listening DECT 6.0 frequency band transmits your voice over numerous channels and gives transcendent voice and sound quality Hear music from your favorite musicians with these earbuds design headset Boom microphone design ensures maximum comfort and easy, hassle-free talking Provides exceptional quality sound with greater immersion