The Clear Sounds CSC500 Spirit amplified phone is great for anyone who needs a simple yet quality amplified phone. This phone has extra loud receiver levels without the need of AC power.Together with an enhanced ring volume, this phone is ideal for the hard of hearing. The ClearSounds CSC500 is designed to ensure easy and effective communication for those who depend on it. Other features include large keypad buttons for easy dialing, up to 108 dB SPL amplification with full range tone control CSC500 Features: Amplified Big Button Corded Phone Digital Clarity Power Technology -Increases Volume for Soft Sounds -Decreases Volume for Loud Sounds Amplified Volume - Up To 40dB Amplified Ringer Hearing Aid Compatible Full Duplex Quality SpeakerPhone 3 One-Touch Emergency Buttons New Call Indicator Speed Dial Adjustable Ringtones Adjustable Speakerphone / Handset Volume Control Extra Loud Adjustable Ringer Volume Bright Visual Ringer Wall Mountable/Mount Included One-Touch Speed Dial Last Number Redial Voicemail Key