NEC SL1000 and SL2100

The 12TXH-A TEL is a 4-wire multiline telephone 

Main features

 hybrid (4 wires) MLT
 12 key programmable keys with leds
 4 feature keys and navigation keys
 Backlit dial pad: No
 Half Duplex Speakerphone
 Call indicator lamp
 8 Selectable ring tones
 20 number personal directory
 1000 number system/group directory
 Adjustable angle
 Built-in wall mount kit
 Energy saving sleep mode
 Available in Black and White