Mackie MP-220 Owner's Manual page 3

INTRODUCTION
We've been helping artists perform their best for decades with
our renowned loudspeaker designs, and now we are bringing that
signature sound straight to your ears.
The MP Series is available in three models, the single dynamic driver
MP-120, dual dynamic driver MP-220, and dual hybrid driver MP-240.
Featuring specially-molded ergonomic enclosures, you will experience
hours of comfort and superior noise isolation.
Plus, the precision-tuned drivers provide incredibly clear and punchy
sound so you never miss a beat. When you want to hear yourself
clearly on stage without all the noise that comes with it, MP Series
In-Ear Monitors have got you covered.