Motorola H790 Quick Start Manual page 22

• Where possible, use your headset in a quiet environment with low background
noise.
• Avoid turning up the volume to block out noisy surroundings.
• Turn the volume down if you can't hear people speaking near you.
If you experience hearing discomfort, including the sensation of pressure or
fullness in your ears, ringing in your ears, or muffled speech, you should stop
listening to the device through your headset or headphones and have your
hearing checked by your doctor.