The CapTel 880i is a voice carry-over Telephone. The CapTel 880i i provides real-time captioning during phone calls. The CapTel 840i provides captions through a high-speed internet connection on Voice-Over IP (VOIP) telephone lines with Wi-Fi capabilities for better connection. All calls are routed through a captioning service center, where someone captions the conversation for the individual. It features an extra wide screen for easier reading. The CapTel 880i features adjustable font sizes and colors, caller ID and can storage capabillity up to 95 names and numbers, a built-in answering machine with captions, an adjustable tone and volume control up to 40 decibels, and can function as a standard phone for individuals that do not need captions. Individuals who has hearing difficulties, and must communicate over VOIP telephone lines to accomplish essential functions of their job may benefit from this device. Captions are only available for calls made within the United States.