Yealink SIP-T54W. Product type: IP Phone, Product colour: Black, Handset type: Wired handset. Dual-Tone Multi-Frequency (DTMF) modes: In-band, Out-of band, SIP info. Lines quantity: 10 lines, Phonebook capacity: 1000 entries. Volume control: Buttons. Display: LCD, Display diagonal: 10.9 cm (4.3″), Display resolution: 480 x 272 pixels