Cisco IP Business Phone 8841, 5-inch Greyscale Display, Gigabit Ethernet Switch, Class 2 PoE, 10 SIP Registrations, 1-Year Limited Hardware Warranty (CP-8841-K9=). Product type: IP Phone, Product colour: Black, Silver, Handset type: Wired handset. Volume control: Digital. Display diagonal: 12.7 cm (5"), Display resolution: 800 x 480 pixels. Voice codecs: G.711a, G.722, G.729A, iLBC. Supported network protocols: IEEE 802.3i/802.3u/802.3ab/802.3af/802.3at, Security algorithms: EAP-FAST, EAP-TLS, HTTPS, SRTP, SSH, SSL/TLS