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 and distinction between similar sounding words like "chair" and "share" , Compatible with most home and office telephones, Connects easily between handset and phone base, no wiring involved, Compact and portable, take it with you everywhere, Battery included.

Features Include:

• Clarity in-line receiver amplifier
• Increases incoming call volume up to 40dB (increases incoming volume up to 100 times)
• Tone selector for maximum speech clarity (amplifies selective frequencies)
• Connects between handset and phone base
• Compatible with most home and office telephones with modular handset cords
• Cannot be used with telephones with dialing pads in the handset
• Turns on automatically when you lift the handset
• Low battery indicator (red LED)
• 9V battery included
• Slide volume and slide tone controls
• Boost button eliminates background noise and feedback for extra loud and clear conversations
• White