Ampli550 - Amplified Telephone with Talking Caller ID and Talking Keys Large 1" back lit easy to see and hear talking keys Extra loud Amplification, up to 55 decibles of extra clear sound 95dB loud ringer & Built-in strobe ring signaler 9 one-touch memory dial buttons: 2 emergency, 6 standard and 1 for customer service Calibrated easy to adjust Volume and Tone control, settings stay in place