Clarity 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;