&bull; Designed for people with mild to severe hearing loss;&bull; Uses ClarityPower(TM) technology;&bull; Increases incoming sounds by up to 40dB;&bull; Adjustable tone control (600Hz-2.4kHz) amplifies specific frequency range for sound clarity & distinction between similar-sounding words like "chair" & "share";&bull; Boost button allows for even more amplification & eliminates background noise & feedback by muting microphone in handset;&bull; Compatible with most home & office telephones where handset is separate from keypad;&bull; Easily connects between handset & phone base--no wiring involved;&bull; Compact & portable;&bull; Includes battery;<br /><br />Length: 8.80"<br />Width: 6.30"<br />Height: 1.80"

Clarity HA40 HA40 Portable Telephone Handset In-Line Amp