JH-A490 OTC Hearing Aid User Manual

Document Version: V1-2
Model: JH-A490 (Over-the-Counter Hearing Aid)
Manufacturer: Huizhou Jinghao Medical Technology Co., Ltd. (JINGHAO)

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Product Overview #

This user manual provides comprehensive instructions for the JH-A490 Over-the-Counter (OTC) Hearing Aid. Please read this manual thoroughly and completely before using the product. This device is intended for users aged 18 or older with mild to moderate hearing loss and should be used under the guidance of professionals.

Table of Contents #

1. Important Safety Warnings & When to See a Doctor
2. Contraindications & Cautions
3. Getting to Know Your Device & Accessories
4. Using the Hearing Aids (Fitting, On/Off, Volume, Programs)
5. Using the Charger & Charging Case
6. Care, Maintenance & Cleaning
7. Troubleshooting Guide
8. Technical Specifications & Regulatory Information

1. Important Safety Warnings (FDA OTC Compliance) #

• Age Restriction: If you are younger than 18, DO NOT use this device. You should go to a doctor, preferably an ENT (Ear-Nose-Throat doctor), because your condition needs specialized care. OTC hearing aids are only for users who are age 18 or older.
• When to See a Doctor: If you have any of the following problems, please see a doctor (preferably an ENT):
  • Your ear has a birth defect, unusual shape, or was injured/deformed in an accident.
  • You saw blood, pus, or fluid coming out of your ear in the past 6 months.
  • Your ear feels painful or uncomfortable, or you have a lot of earwax.
  • You get really dizzy, have vertigo, or hear ringing/buzzing in only one ear.
  • Your hearing changed suddenly in the past 6 months, or it gets worse then gets better again.
• Pain Warning: This hearing aid should not cause pain when inserting it. Remove the device if it causes pain or discomfort. If pain persists, contact your hearing healthcare professional or report it to the FDA.

2. Contraindications #

Do NOT use this device if you have:

• Congenital atresia of the external ear or deformity of any part of the ear canal.
• Unstable deafness, or fluctuating hearing loss.
• Persistent headaches, dizziness, earaches, or tinnitus.
• Sudden onset of hearing loss within the past 3 months, rapid progressive deafness, or unilateral hearing loss.
• Effusion (secretions/discharge) in the ear or frequent purulence (pus).
• Acute otitis externa, tympanitis, or acute/chronic suppurative otitis media.
• Allergic reactions to the materials of this product.

3. Getting to Know Your Device #

• Hearing Aid: Features a multi-function button, sound inlet, charging contacts, thread (for easy removal), and soft silicone eartip.
• Charging Case: Features L/R charging slots, L/R charging indicators (orange for charging, green for fully charged), a middle case charging indicator, and a USB charging port.
• Markings: Blue marking indicates the Left hearing aid; Red marking indicates the Right hearing aid.

4. Using the Hearing Aids #

• Activation: Remove stickers. Place hearing aids in the charging case and connect to a power source to activate.
• Fitting Eartips: Choose the suitable size (L/M/S). Push firmly to ensure it is fastened securely. Pull gently to check.
• ON/OFF:
  • Auto: Turn ON about 12 seconds after removal from the case. Turn OFF automatically when placed back.
  • Manual: Press and hold the multi-function button for 2 seconds to turn on/off.
• Volume Control: 5 volume levels. Short press the multi-function button to adjust.
• Program Switch: 2 preset programs (Normal, Restaurant). Quickly press the multi-function button twice to switch.
• Wearing: Insert the hearing aid with the thread facing downwards. If whistling occurs, reinsert correctly or replace with a bigger eartip.

5. Using the Charger #

• Charging the Hearing Aids: Place them in the correct L/R slots. Orange lights indicate charging; Green lights indicate fully charged. When the case battery is <30%, the middle indicator flashes orange.
• Charging the Case: Plug the USB cable into the back of the case and connect to a power adapter. Orange light (middle) indicates charging; Green light indicates fully charged.

6. Maintenance & Cleaning #

• Do not drop the hearing aids or expose them to high temperatures, humidity, or liquids.
• Do not use sharp tools to dislodge earwax.
• Clean eartips daily with the provided cleaning tool. Wipe the hearing aid surface with a soft cloth. Do not use alcohol or solvents.
• Replace eartips every 3-6 months or when they become stiff, brittle, or discolored.

7. Troubleshooting Guide #

• Feedback/Whistling: Check if the eartip is broken or clogged. Ensure correct insertion. Try a larger eartip or remove earwax.
• No Sound/Voice is Weak: Check if the device is on, battery is charged, volume is high enough, or if the microphone is clogged.
• Charging Case Issue: Ensure the adapter is powered, the USB cable is connected correctly, and the charging contacts are clean.

8. Technical Specifications (Program 1) #

• Test Standard: ANSI S3.22-2014
• Max Output (OSPL90): 107dB
• HFA FOG@50: 29dB
• Total Harmonic Distortion (THD): 1%
• Equivalent Input Noise (EIN): 23dB
• Latency: 1ms
• Frequency Response Bandwidth: f1=200Hz, f2=5600Hz
• Battery Life: ≥14 hours
• Operating Environment: 0°C~40°C, 30%-75%RH

Regulatory Information & Manufacturer #

Manufacturer: Huizhou Jinghao Medical Technology Co., Ltd.
Address: No. 207, South SiHuan Rd, ZhongKai Hi-tech District, Huizhou, Guangdong, China. Zip Code: 516000
Website: www.jhhearingaids.com | Email: emily@jhhearingaids.com
Warranty: This limited warranty covers defects in material and workmanship for one (1) year from the date of purchase.