The Clarity HA40 Portable Telephone Handset Amplifier featuring Clarity® Power technology makes telephone conversations not only louder, but also clearer and easier to understand. 

NOTE: Not compatible with Trimline, Princess style or cordless phones where dial keypad is in handset

Features 

• Amplifies incoming sound up to 40dB
• Adjustable incoming volume control
• Adjustable tone control (600-2400Hz) 
• Tone selector amplifies specific frequencies for optimum speech clarity
• Boost button allows for even more amplification and eliminates background noise and feedback by muting the microphone in the handset 
• Connects easily between handset and telephone base - compatible with most home and office phones
• One-year manufacturer's warranty

What's in the Box? 

• HA-40 Amplifier
• Cord
• User guide

Specs

• Dimensions: 2 x 9 x 6.4 inches
• Weight: 1lb
• Control type: Button control

Documentation

HA40 Phone Amplifier User Guide