The ZIP 51e and ZIP 53e : models offer good value for the features offered by these entry-level phones. The ZIP 51e and ZIP 53e are well-featured with a 3-line/16 character LCD display, adjustable contrast, 8 programmable keys with LEDs, up to 6 line/call appearance keys with LEDs, call log directory and local 3-way conferencing. The ZIP 51e connects via a single 10/100 Mbps switched Ethernet port and is powered only via a standard AC adaptor. The ZIP 53e connects via dual 10/100 Mbps switched Ethernet ports and is powered via 802.3af Power Over Ethernet or a standard AC adaptor (sold separately). The ZIP 51e and ZIP 53e are ideal for light telephone use for the small and home-based business.