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Serene HD-40S - Amplifies OUTGOING Speech Up to 40 dB

Serene Outgoing Speech Amplified Telephone Model HD-40S

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The Serene HD-40S Outgoing Speech Amplified Telephone W/ Photo Memory Speed Dial offers outgoing voice amplification up to 40dB and incoming voice amplification up to 18dB. This phone is designed for those with speech loss and mild to moderate hearing loss. 

Product Features: 

  • HDS (High-Definition Sound) Technology makes even the weakest voice sharp, clear and easily audible, a new standard in speech amplified telephone technology
  • Amplifies the out-going voice up to 40dB
  • Can be easily set to amplify the incoming sound up to 18 dB
  • Latest DSP (Digital Sound Processing) technology eliminates virtually all distortion, echo effects and unwanted static commonly found in other ordinary amplified phones
  • 9 easy to use photo-memory buttons for one-touch dialing
  • Two (front and side) visual ring flashers that flash when the phone rings
  • 95+dB super loud ringer with adjustable ringing volume and tone controls
  • Battery backup for power outages (batteries not included)
  • Hearing aid compatibility

One year warranty

More information

Product Specifications: 

Incoming Speech Amplification: 0 to 18 dB

Out-Going Speech Amplification: 0 to 40 dB (note HD-40S can only be used either
as an incoming or outgoing speech amplify phone - but not both at the same time).

Battery backup supports full amplification and all functions during AC power outage.

Hearing Aid Compatible Receiver: Yes

Ringer Loudness: Hi – Mid – Low (95 dB max)

Ringer Tone: Low – High

Ring Flasher: Yes (front and side)

Auto-Amplify Switch (Auto-Reset Switch): Yes

Photo Memory Buttons: 9

Dialing Method: Tone / Pulse

Redial, Flash, Pause Keys: Yes

Power Requirements

9 vdc, 300 ma power adapter

Optional 4 AA size alkaline batteries backup supports full amplification and all

functions during AC power outage.

HD-40S function as a simple phone if no battery or AC adapter are available


Handset Size: 8.2” x 2.0” x 1.9”

Base Size: 9.0” x 7.4” x 2.5”


Handset Weight: 6 oz.

Base Weight: 21 oz.

Temperature range

Operating: 0 to 30°C

Storage: -10 to 40°C



If you are not completely satisfied with your purchase within 30 days, we will help you find the perfect replacement.

  • Store Hours:
  • Monday, Tuesday, Thursday, Friday:
  • 10am - 4pm
  • Wednesday, Saturday & Sunday:
  • Closed