The North Supply Micro MOH is a single track on-hold player designed to meet the basic needs of companies that donít change their program very often.Don't let the North Supply Micro MOH's small size fool you. Hidden inside its compact, no frills enclosure is a cutting edge design packed with useful features. It is capable of playing both MP3 and WAV files that are compressed at the highest bit rate (i.e. the best sound quality.) and the generous amount of internal flash memory makes it possible to play up to 4 hours of non-repeating crystal clear audio!