3M WorkTunes - At-A-Glance; Noise Reduction Rating; Voice Assist; Bass Boost Options

4
Basic Operations
Install two 1.5V AA batteries as shown.
Close battery door until it clicks.
Note:
- Do not mix old and new batteries.
- Do not mix alkaline, standard or
rechargeable batteries.
Press and hold the On/Off/Volume
button for 2 seconds to power hearing
protector. Turn the knob to adjust the
volume up or down.
Installing Batteries: Power and Volume: