This amplified VCO is an extremely versatile telephone designed to meet the needs of people with hearing loss and their families. It not only enables people with different hearing abilities to communicate easier and more naturally, it offers all of the latest convenient features you ever wanted in a telephone. With its powerful hearing aid compatible amplifier, tone amplification selector and automatic tone enhancement, incoming voices can be amplified up to 30 decibels for loud and clear conversations. For people with severe hearing loss or who are deaf, VCO (voice carry-over) calls can be made throught the local toll free Relay Service. VCO allows you to speak into the handset while 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 assistive listening devices (headset, neckloop, etc.), Hearing aid (T-Coil) compatible handset, Ten (10) memory buttons for one-touch speed dialing, Programmable relay service number and preset message initiates VCO Call-no dialing required, One-touch Programmable emergency button transmits user's name, address and phone number in text for quick response by emergency services, Large easy-to-see oversized keypad buttons make dialing/typing easy, Hold/Flash/Program/Redial buttons, Desk or Wall mountable.