The corded phone is designed to amplify incoming sound to up 40 dB, while the cordless handset amplifies sound up to 35 dB; 4 Tone Settings; Amplified Digital Answering Machine; Large High-Contrast Caller Id Display Lights Up As A Super-Bright Visual Ringer; Extra Loud & Clear Speakerphone For Hands-Free Conversations; Large Keypad with High Contrast Numbers; 5 Speed Dial Buttons To Store Important Numbers; 10 Loud Ringer Melodies with 6 Levels Of Volume; Expandable Up To 4 Cordless Handsets