This in-line receiver amplifier turns on automatically when you lift the handset and increases incoming call volume up to 100 times.
This super phone ringer amplifies the ring volume to 95db.
HearAll Cell Phone Amplifier, you will hear every word, even in noisy environments. No more muffled words or straining to hear! With amplification up to 100 times louder
Amplify your outgoing voice on the telephone with the VM Inline Voice Magnifier device