Clarity HA40 HA40 Portable Telephone Handset In-Line Amp

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