The Hamilton CapTel 840i Telephone provides accurate, real-time captions to show you what a caller is saying when you're on the phone. It works like a traditional phone, but includes volume amplification and text display to solve communication problems caused by mild to severe hearing loss. Remove frustration and enjoy your conversations with CapTel. HOW IT WORKS: The CapTel 840i phone connects to both your phone service and the Internet. The Internet connection links the phone to a Captioning Service that uses voice-recognition technology to transcribe your conversations at no additional charge. The captions are sent back over the Internet to your CapTel 840i phone, and appear in the display window for you to read. FEATURES: Captions appear automatically on all calls. Adjustable font sizes and colors. Display screen tilts for comfortable reading. Captions can be turned on or off at any time in a call. Adjustable volume control. One-touch access to CapTel Customer Service. Speed dial keys for one-touch dialing. Easy-to-follow menu system with Yes/No questions. Supports English and Spanish speakers. CONTENTS: CapTel 840i Phone, Telephone Cord, Power Adapter, Ethernet Cable, CapTel Installation How-To Guide, Warranty Card. REQUIREMENTS: High-speed Internet access (connects to Ethernet jack). A router may also be required to connect more than one device to your Internet service. Telephone service (can be analog line, VOIP, FIOS, DSL or digital cable phone service. Cannot be cellular service.) Not compatible with PBX systems unless analog port available. Standard electrical power (AC adapter plugs into standard wall outlet).