Cordless Mobility — Each 57i CT base supports up to 4 cordless handsets
11 line graphical LCD screen (144 x 128 pixels) with white backlight
12 multi-functional softkeys
6 Top Keys: Programmable static softkeys (up to 10 programmable functions)
6 Bottom Keys: Programmable state-based softkeys (up to 20 programmable functions)
4 call appearance lines with LEDs
Supports up to 9 call lines
Full-duplex speakerphone for handsfree calls
Headset support (modular connector)
Built-in-two-port, 10/100 Ethernet switch - lets you share a connection with your computer.
Inline power support (based on 802.3af standard) which eliminates power adapters.
AC power adapter (included)
Expandable up to 3 modules of model 536M and 560M
Enhanced busy lamp fields*
Set paging*
* Availability of feature dependant on your phone system or service provider.