Powertone F-138 – Key Features

• Hearing Aid Type:
  Behind-the-ear (BTE) amplifier; small and lightweight design for discreet, daily use.

• Maximum Sound Output:
  Approximately 130 dB ± 5 dB — powerful enough to assist users with mild to moderate hearing loss.

• Gain (Amplification):
  At least 50 dB of gain — helps amplify quiet sounds to a clear listening level.

• Frequency Response Range:
  Covers frequencies roughly between 300 Hz and 4 kHz, which includes the speech range necessary for clarity in most conversations.

• Total Harmonic Distortion (THD):
  ≤ 5%, meaning the sound remains mostly clear and undistorted at this level of amplification.

• Input Noise Level:
  ≤ 30 dB, which helps maintain acceptable sound quality without excessive background hiss.

• Power and Battery Specs:
  Operates on DC 1.5 V, requires ≤ 4 mA current. Uses AG13 (LR44) or Zinc-Air A675 button-cell batteries.

• Volume Control:
  Adjustable, typically with 4 volume levels, allowing basic user control over amplification intensity.

• Design & Comfort:
  Compact and ergonomically designed with multiple ear-tip sizes to ensure a snug, comfortable fit.

• Certifications:
  Listings mention CE and ISO (e.g., ISO 13485) certifications.

At a Glance

• Intended for basic hearing amplification, not advanced programmed hearing aids.

• Ideal for users needing a simple, affordable solution to improve everyday hearing.

• Lacks advanced features like noise filtering, Bluetooth connectivity, or audiologist programming.

• Battery-powered with standard button-cell batteries.