The Redco Little Red Cue Box is a professional audio monitoring device which allows up to four stereo headphones to be controlled separately. A typical use of the Cue Box would be for musicians to listen to the cue mix while laying down tracks in a recording studio.You can connect up to four pairs of dynamic headphones to the Headphone outputs using 1/4” stereo phone plugs. The volume of each pair of headphones can then be controlled separately, providing a comfortable listening level for each musician while listening to the same cue mix. A typical instance when this is important is while background vocals are being recorded and more than one singer is using the same microphone and cue.