ClearSounds PHONE A1600 - Manual (Page 8)

8 – ENGLISH
and insert the rechargeable batteries in accordance with the
polarity symbols. Use only batteries identified as acceptable
and never use alkaline batteries, which can cause personal
injury as well as damage to the unit.
Hearing Aid Compatibility (HAC)
This phone meets the FCC standards for Hearing Aid
Compatibility.
IMPORTANT : YOUR RECEIPT IS PART OF YOUR WARRANTY
AND MUST BE RETAINED AND PRODUCED IN THE EVENT OF A
WARRANTY CLAIM.
Dial/ Speakerphone Key