Upgrade your Hear Back PRO monitor mixers with OLED-screen electronic labeling with this four pack of PRO Digital Overlays from Hear Technologies. Less than 3mm thick, each overlay installs right on the mixer face and connects to the mixer’s expansion port via ribbon cable, providing neat labeling of the channels and mixer functions. The overlay’s bright OLED displays are easy to see in the studio or during live performances. Naming functions are done remotely using the iOS app or a computer