Sing with us! The clearly structured user interface of the SA-250/SW just invites you to listen to music and to make music in particular. One of three stereo line and three mono microphone sources can be easily mixed together. Functions such as "One Touch Karaoke" or "Vocal Partner" are available in conjunction with special karaoke CDs/DVDs. An adjustable digital echo can be added to the microphone channels as an effect. The amplifier’s fanless cooling concept amplifier ensures silent operation. Modern protective circuit mechanisms provide safety in the event of overload, overheating and short circuit.