In-Line Handset Amplifier - 40 DB

Designed for people with mild to severe hearing loss. Increases incoming sounds up to 40 dB louder. Adjustable tone control amplifies specific frequency range for sound clarity & distinction between similar sounding words like "chair" & "share". Compatible with most home & office telephones. Connects easily between handset & phone base, no wiring involved. Compact & portable, take it with you everywhere. Includes battery.