SIP-T53W Entry-level phone, well suited for common workspace; 3.7" 360x160-pixel graphical display, fully adjustable; HD Voice with Yealink Acoustic Shield technology; 8 line keys, 12 SIP accounts w/ 21 memory keys; Built-in Bluetooth, Wi-Fi (T53W model only); Dual-port Gigabit Ethernet; 1xUSB port for call recording and wireless USB headset.