You can add more phones to your A500 amplified phone system with the ClearSounds A500 DECT 6.0 Amplified Cordless Extra Handset. This add-on handset offers the same features as your original handset and integrates seamlessly into your existing phone system. The system supports up to five handsets total, so you can place an amplified phone in every room in your home! FEATURES: System supports 5 handsets. Up to 40 dB adjustable amplification. 6-level ringer volume control. Talking Caller ID, keypad, and ringtone. High-contrast keypad with big buttons. CONTENTS: Handset, Charging Base, Carrying Clip, Phone Line Cord, AC Power Adapter, (3) Rechargeable Batteries, User's Guide. NOTE: Caller ID requires subscription to Caller ID service through your local telephone service provider.