1. Introduction
This manual provides detailed instructions for the proper use, setup, operation, maintenance, and troubleshooting of your AMERFIST Digital Personal Sound Amplifier. Please read this manual thoroughly before using the device to ensure optimal performance and safety. Keep this manual for future reference.
2. Package Contents
Verify that all items listed below are included in your package:
- 1 x Rechargeable Digital Personal Sound Amplifier
- 1 x Compact Carrying Case
- 5 x Ear Domes (various sizes)
- 1 x USB Charging Cable
- 1 x Power Adapter
- 1 x Cleaning Brush
- 1 x Instruction Manual
Figure 2.1: Package Contents. This image displays the amplifier, charging accessories, ear domes, cleaning brush, and carrying case included with your purchase.
3. Product Overview
Familiarize yourself with the components and controls of your AMERFIST Digital Personal Sound Amplifier.
Figure 3.1: Key Functions Diagram. This diagram labels the various parts of the amplifier, such as the microphone, volume control, mode button, ON/OFF switch, charging indicator, USB socket, ear hook, sound tube, earphone, and earplug.
- Volume Control: Adjusts the sound amplification level (0-Min to 4-Max).
- Microphone: Collects ambient sounds.
- Ear Hook: Designed for comfortable and secure placement behind the ear.
- Sound Tube: Connects the amplifier to the earphone, adjustable for left or right ear.
- Earphone: Delivers amplified sound into the ear canal.
- USB Socket: For charging the device.
- Mode Button (M): Cycles through different sound modes.
- ON/OFF Switch (O/N): Powers the device on or off.
- Charging Indicator: Light flashes during charging and remains solid when fully charged.
- Earplug: Inserted into the ear canal to seal and direct sound.
4. Setup
4.1. Charging the Device
Before first use, fully charge your amplifier. A full charge takes approximately 3 hours and provides up to 80 hours of working time.
- Connect the USB charging cable to the USB socket on the amplifier.
- Plug the other end of the USB cable into the provided power adapter, then plug the adapter into a wall outlet.
- The charging indicator light will flash during charging.
- Once fully charged, the indicator light will remain solid green. Disconnect the charger.
Figure 4.1: Charging the Amplifier. The image illustrates the amplifier connected to its charger, with the charging indicator light active.
4.2. Selecting and Attaching Earplugs
Choose an earplug size that provides a comfortable and snug fit in your ear canal to prevent sound leakage and whistling.
Figure 4.2: Earplug Selection. This image shows the five different earplug sizes available to ensure a comfortable and effective fit.
- Examine the provided ear domes and select the size that best fits your ear canal. A good fit is crucial for sound quality and to prevent feedback.
- Gently push the chosen earplug onto the end of the sound tube until it is securely attached.
5. Operating Instructions
5.1. Wearing the Amplifier
Proper placement ensures comfort and optimal sound delivery.
- Before placing the amplifier, ensure the volume is set to the minimum (0) and the device is turned off.
- Adjust the sound tube to the correct angle for your ear.
- Place the ear hook over the top of your ear.
- Gently insert the earplug into your ear canal, ensuring a snug fit without any gaps. This prevents whistling.
Figure 5.1: Steps for Usage. This visual guide demonstrates the process of selecting earplugs, adjusting the device, setting the volume, and correctly wearing the amplifier.
5.2. Powering On/Off
Use the ON/OFF switch located on the side of the device.
- To turn on: Slide the switch to the 'N' position.
- To turn off: Slide the switch to the 'O' position.
5.3. Adjusting Volume
The volume control allows you to set the amplification level.
- After wearing the amplifier and turning it on, slowly increase the volume using the volume control dial.
- Adjust to a comfortable listening level. Avoid excessively high volumes.
5.4. Selecting Sound Modes
The amplifier features four distinct sound modes, optimized for various environments. Press the 'M' button to cycle through the modes.
Figure 5.2: Four Sound Modes. This image depicts the four available sound modes and their recommended usage scenarios.
- Daily Life Mode: High Frequency Mode, suitable for general conversations and everyday listening.
- Indoor Mode: Broadband Mode, ideal for indoor environments like homes or offices.
- Outdoor Mode: Low Frequency Mode, designed for outdoor activities.
- Noisy Street Mode: Midband Mode, helps to reduce background noise in loud environments.
6. Maintenance
Regular cleaning and proper care will extend the life of your amplifier.
- Cleaning the Earplugs: Regularly inspect earplugs for earwax buildup. Use the provided cleaning brush to gently remove any debris. Replace earplugs if they become damaged or discolored.
- Cleaning the Device: Wipe the main body of the amplifier with a soft, dry cloth. Do not use liquids or cleaning solutions directly on the device.
- Storage: When not in use, store the amplifier in its compact carrying case in a cool, dry place away from direct sunlight and extreme temperatures.
7. Troubleshooting
If you encounter issues with your amplifier, refer to the following common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Background Noise / Static | Electric current sound (common in amplifiers); initial adjustment period. | Insert the device into your ear before turning it on. Gradually increase the volume. Allow 2-3 weeks for adaptation. |
| Whistling / Squealing Sound | Ear dome not properly sealed in ear canal; air leakage; device too close to an object (e.g., hand, wall). | Ensure the ear dome is the correct size and fits snugly in your ear canal. Turn on the device only after it is securely in your ear. Avoid placing hands or objects too close to the device while in use. |
| Device Not Working / Low Performance | Battery not fully charged; earwax buildup on the earplug. | Ensure the device is fully charged (refer to Section 4.1). Clean the earplug thoroughly to remove any earwax (refer to Section 6). |
8. Specifications
Technical details of the AMERFIST Digital Personal Sound Amplifier.
- Model Number: aea70ebf-2b99-4a8c-9eb4-ca3178ae2a36
- Brand: AMERFIST
- Color: Brown
- Material: Medical Grade
- Power Source: Battery Powered (Rechargeable)
- Package Dimensions: 6.06 x 3.86 x 1.65 inches
- Item Weight: 7.83 ounces
- First Available Date: May 30, 2021
9. Important Disclaimer
This device is a personal sound amplifier. Statements regarding this product have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition. Consult with a healthcare professional for any hearing-related concerns.
10. Warranty and Support
Specific warranty information for the AMERFIST Digital Personal Sound Amplifier is not provided within this manual. For details regarding warranty coverage, technical support, or service inquiries, please refer to the product packaging or contact AMERFIST customer service directly through their official channels.
