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Turning on your device

  • AMP: The AMP's battery door functions as the on/off switch.
    • To turn the AMP on, close the battery door completely.
    • To turn it off, open the battery door. 
  • OHM: The OHM's program button functions as the on/off switch.
    • To turn the OHM on, press and hold the program button for 2-3 seconds. The light will flash green once when turned on.
    • To turn it off, press and hold the program button for 2-3 seconds. The light will flash blue once when turned off.

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Wearing your device


Step 1: Insert the tip with gentle pressure into the entrance of your ear canal.

Step 2: Place the body of the device behind your ear.

Step 3:Tuck the stabilizer bar into the outer bowl of your ear. It may be trimmed to suit the size of your ear. 

Please note: Whistling may be heard if the device is turned on but not securely in your ear. This is normal and a sign that your device is working. Once the tip is properly inserted, the whistling will stop. If the whistling continues while in your device is your ear, please contact MDHearing Support.

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Changing/Charging the Battery

  • The MDHearing AMP uses size 13 zinc-air batteries.
    • Before inserting a new battery into your device, remember to remove the orange adhesive tab and wait a full minute for the battery to activate.
    • The battery must be placed in the battery compartment with the positive (+) side facing up. If the battery compartment does not close easily, the battery is inserted incorrectly. Never force the battery door shut. It may permanently damage your device.
  • The MDHearing OHM uses a rechargeable lithium-ion battery that cannot be removed from the device. 
    • To charge the device, plug the charging dock into a standard outlet. Place the OHM on the charging dock and the light will turn green. 
    • When fully charged, the blue light on the OHM will turn green and the OHM is ready to use.
    • It takes approximately 3-3.5 hours to fully charge the device. On average, a full charge lasts 18-22 hours. 

Battery Tips and Warnings

  • Please note the expiration date on the battery, and never leave exhausted batteries in the device, as they may leak and damage the device.
  • Always remove the battery from your device if it will not be used for a prolonged period of time.
  • The life of the battery depends on a number of factors, such as the settings of your device and the number of hours used per day.
  • In rare cases, a new battery may be exhausted because it was not sealed properly. If your device does not work after replacing a battery, try inserting a different new battery and remember to wait a full minute after removing the adhesive tab on the battery before use.
  • CAUTION: Batteries can be harmful if swallowed. Be sure to keep batteries out of reach from children and pets. If a battery is accidentally swallowed, seek medical attention immediately, or call the National Battery Hotline collect at 800-498-8666.

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Changing Programs

The AMP and the OHM have four environment programs to accommodate the most common hearing situations. To change the amplification program on your device, press the program button. Beeps will indicate a program change. 

Please note: The device resets to the default program #1 (quiet) when it is turned off and back on.

ProgramBest ForIndicator
QuietWatching TV and time with family at home.One beep
SocialSmall group meetings, church, time with friends.Two beeps
NoisyLarge crowds, restaurants, traffic, nature sounds, or high octave music.Three beeps
RestaurantReduce background noise in any loud environment.Four beeps

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Maintenance & Care

Daily cleaning is essential to keeping your your device performing optimally. The most common issue is small blockages of earwax in the tubing, blocking sound from getting to your ear. These blockages can be nearly invisible to the human eye. We recommend replacing the tubing and tips every three months for optimal performance.

How to clean your tubing

  1. Remove tubing from the device.
    • AMP: Rotate the tubing base counter-clockwise (like a bottle cap). Please note: If you have a battery in the device, you should hear a whistle from the AMP. This is normal and a sound that indicates your device is working properly. Open the battery door fully to silence your device.
    • OHM: Rotate the tubing base 90° and slide off. Please note: If the OHM is on and charged, you should hear a whistle. This is normal and a sound that indicates your device is working properly. Press and hold the program button for 3 seconds to turn the device off and silence it.
  2. Thread the cleaning tool wire through the triangular base of the tubing until it pops out of the tip. 
  3. Wipe the end of the wire clean and pull wire back out through the tubing. Do this as many times as necessary until the wire and tubing is free of any debris. 
  4. Use the cleaning tool brush to gently brush away wax and other debris from the tip.
  5. Reattach the tubing onto your device. 
    • AMP: Gently rotate the tubing base clockwise onto your device. Make sure tubing base is flush with sides of AMP body when you are finished. 
    • OHM: Gently push new tubing on. Make sure tubing base is flush with sides of OHM body when you are finished. 

How to clean your device

  1. Wipe the body of the device with a tissue or microfiber cloth.
  2. Use the cleaning tool brush to gently clean away wax and other debris from buttons and microphone.

    Please note: Do NOT use water, alcohol, or any other liquid agent to clean the device as it may damage it.

Tips for optimal performance

  • Keep your ears clean. For best results, it may be beneficial to clean your ears with an over-the-counter ear wash kit or visit your physician.
  • Avoid exposing your device to excess moisture or heat. Do not use hair spray or a hair dryer while wearing your device.
  • Avoid physical shock, such as dropping it on the ground.
  • Store your device in a cool dry place when not in use
  • If you are going to store your device for a prolonged period of time, remove the battery to prevent any possible damage from corrosion

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Troubleshooting: No sound from your device

  • Clean your tubing, reattach the tubing, and test the device again. If the device still does not function correctly, check to see if the tubing has any perforations or damage. If the device whistles without tubing on but does not produce sound with tubing, you may need to purchase new tubing. We recommend the tubing and tips are replaced every three months.
  • For AMP: make sure battery is fresh and inserted correctly (positive side up) and battery door is completely closed. If there is any doubt, try a new one (remember to remove the adhesive tab on the battery surface and wait one full minute before using a new battery).
  • Check the battery contacts for corrosion.
  • For OHM: turn off, charge until the blue light turns green, and turn OHM back on.
  • Reposition the ComfortTip in your ear canal.
  • Check the tips for wax that may be blocking or for any signs of wear. Replace the tips if they appear stiff, bent, cracked, or frayed.
  • Humid environments, sweat, and moisture may clog the device and distort sounds. Consider using a hearing instrument dehumidifier overnight.
  • If your problem persists, email us at support@mdhearing.com with a description of your problem.

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Troubleshooting: Excessive whistling

  • The device makes a whistling sound when in the ear
    • Whistling (feedback) occurs when the amplified sound returns to the microphone and is re-amplfied.
    • Sometimes feedback may occur when you have a blockage of wax in the ear canal, a stiff eardrum (from a cold, for example), or any condition that causes sound to be reflected from the ear canal. In these cases, the fit may be fine, and the feedback will disappear when the condition is corrected.
    • Check for any cracks in the tubing. For optimal performance, the tubing and ear tips should be changed every 3-6 months.
    • Try a program with a lower volume setting.
    • Clean any wax that may be interfering with the tubing.
  • The device makes a whistling sound with no tubing attached
    • Whistling without tubing is a sign that your device is working properly.
    • Open the battery door to turn off your device and stop the feedback from occurring.
  • The device whistles intermittently
    • Check that the tubing is fully pushed onto the device and the ComfortTip is pushed fully onto the tubing. The end of ComfortTip should be flush with the end of the tubing when properly assembled.
    • Make sure the ComfortTip is properly positioned in the ear canal.
    • Check the tips for wax that may be blocking or for any signs of wear. Replace the tips if they appear stiff, bent, cracked, or frayed.

If the problem persists, email us at support@mdhearing.com with a description of your problem.

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Using the Telephone

When using your device with the telephone, try various positions with the telephone receiver, until you discover the arrangement that works best for you.

  • Hold the telephone near your device's microphone at the front and top of your ear.
  • Hold the phone behind your ear, below your ear, or angled such that the phone receiver is tilted and open forward.
  • Your device can also be used with the speaker phone function.

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For more information about your particular device, please reference the specific manual below.

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Getting the most from your device

To get the most out of your device, remember these 3 keys:


When you start using any amplification device, your brain has to learn how to listen to sounds it has not had to process in years or has never processed.

This can be a big adjustment, but the human brain is an amazingly adaptable. At any age, the brain can still can relearn to how to properly process these sounds, but it takes time and practice. Medical studies have shown that your brain requires several weeks to adjust to a new sound environment and become accustomed to your new amplification device. During this time:

  • You may initially notice lots of background noises. These noises have always been a part of your environment, and in time your brain will tune out many of them.
  • You may find that a quiet environment is more comfortable in the beginning.
  • Gradually introduce new listening environments as your ears become accustomed to the sounds from your device and remember to try all four programs.
  • The addition of new sounds in your life can be overwhelming. Try wearing your device for a short period each day and gradually extend the time that you wear them as you feel comfortable.
  • In noisy environments, you may find it easier to understand what is being said by facing the speaker.
  • Your own voice may sound too loud. This is very common for new users. Most people find that they get used to the level of their own voice in a few days.
  • You may also feel plugged up or feel like you’re talking in a barrel. This is called the occlusion effect is a normal reaction to having something in your ear canal. The sensation usually goes away in the first few weeks.

Using an amplification device to its fullest can take practice and patience. Some people adjust very quickly, and most adapt within a few weeks. Please do not give up prematurely.


Everyone is born with two ears for a reason. The brain takes the sound input from both ears to understand a particular sound or voice. It is best to maintain balance by wearing an MDHearing in each ear. By maintaining balanced amplification you will experience:

  • Significantly better understanding of speech and conversation.
  • Less overall background noise amplification.
  • Better hearing and understanding in noisy situations.
  • Better localization of the direction of sounds.
  • Listening will be more pleasing and effortless.
  • Sound is balanced and more natural, especially music.

Better hearing is a journey. Many people tend to crank up the volume when they miss a word or two—resist the temptation to do this, hearing is not just about volume. The most important thing you can do is set the volume to a comfortable level and let your brain adjust. Here's a great way to find the best volume to start with:

  • Find a friend and a small, quiet room.
  • Have your friend talk to you in a normal conversational voice.
  • Adjust the volume on your hearing aid until their voice is at a comfortable level. Do not worry about if you are catching every word. Set the volume so your friends voice is not overwhelming and is not barely a whisper.
  • Now that we've created a nice baseline volume for your brain, cycle through the program settings to see which program sounds best with your hearing.
  • Resist the temptation to fiddle constantly with the volume, unless absolutely necessary. The world can be a loud place, but your brain will eventually adjust if you give it the opportunity.
  • Remember to enjoy you hearing! Every sound is a blessing, and sometimes it's easy to forget how fortunate we are to hear anything and everything.

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Information about Personal Sound Amplification Products

PSAPs are not intended to make up for impaired hearing. Instead, they are intended for non-hearing-impaired consumers to amplify sounds in the environment for a number of reasons, such as for recreational activities. If you believe you need a hearing aid, please consult a physician or audiologist for a thorough hearing examination.

If you have or think you may have any one of the following symptoms, do not use this product until you have consulted a physician:

  • Visible deformity of the ear
  • Pain or discomfort in the ear
  • Hearing on one side that worsened in the past 90 days
  • Fluid or drainage from the ear within the past 90 days
  • Sudden, rapidly progressing, or fluctuating hearing loss
  • Spells of acute or chronic dizziness
  • Ear canal blockage, a lasting ear infection or a plugged up fullness feeling
  • Excessive wax buildup, or a history of excessive wax buildup
  • Ringing in one or both ears within last 90 days

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