In-Ear Monitoring Headphone Amplifier is the ideal partner for singers, keyboardists, drummers, guitarists, bassists and other musicians. It establishes the connection between the monitoring signal from the mixing console, instrument or amp and your own headphones. On stage, in the rehearsal room or at home, the RockBoard HA 1 in-ear monitoring headphone amplifier always offers full control over the monitoring signal. In small clubs, in-ear monitoring improves the acoustics in the hall; when the band turns up the volume again, the signal is quickly adjusted and you can enjoy the same sound in every part of the room.