Yealink SIP-T53. Product type: IP Phone, Product colour: Grey, Handset type: Wired handset. Dual-Tone Multi-Frequency (DTMF) modes: In-band, Out-of band, SIP info. Lines quantity: 8 lines, Phonebook capacity: 1000 entries. Volume control: Buttons. Display: LCD, Display diagonal: 9.4 cm (3.7"), Display resolution: 360 x 160 pixels