The Ameriphone VCO Phone is made for deaf and people whose hearing power is very low and wish to use their voice to speak on the phone. With its strong hearing aid compatible amplifier, tone amplification selector and automatic tune amplification, incoming voices can be amplified up to 26 decibels for loud and crystal clear conversations. For users with severe hearing loss or who are deaf, VCO (voice carry-over) calls can be made through the local toll free relay service. VCO permits you to speak into the handset at the same time the incoming messages are displayed as text on the screen. Just read and talk. It's that simple. Other features include built-in text answering machine that can also work with most voice answering machines, 3.5mm audio output jack for connection to helpful listening devices (headset, neck loop, etc.), hearing aid (T-Coil) compatible handset and 10 memory buttons for one-touch quick dialing. This phone is desk or wall mountable and is powered by A/C adapter. VCO Features: Amplified Big Button Speak & Read Corded Phone Designed for People w/ Severe Hearing Loss / Deafness That Still Want to Use Their Voice Speak Into the Handset & Read Responses on the Display Screen Adjustable Amplification Up To 26 dB Built-In Answering Machine for Text Messages, Also Works w/ Your Voice Answering Machine Voice Carry Over Calls Must be Placed Through Toll-Free Relay Service Programmable Relay Service Speed Dial Button Programmable Emergency Button Transmits User's Name, Address & Phone Number in Text for Quick Response by Emergency Services 10 Memory Buttons Programmable Preset Text Message for Quick VCO Calling, No Typing Required Handset is Hearing Aid T-Coil Compatible Works w/ Large Visual Display & Portable Printer Bright Ring Flasher Super Loud Ringer Easy-To-See Oversized Keypad Buttons Battery Back-Up (Battery Not Included) Redial / Hold / Flash 3.5mm Audio Output Jack For Assistive Devices Wall Mountable Supports TTY Communication Speak Into the Handset & Read Responses on the Display Screen Tone Control Lets You Customize The Amplifier For Optimum Clarity 10 One-Touch Memory Buttons Brand New Includes One Year Warranty !