Yealink T4 Series - Intended for discerning users with very high expectations for their IP phones. Extra-large display screens, support for gigabit networks, USB Bluetooth support for easy Bluetooth earphone use, enhanced sound quality delivered by the Optima HD Voice system.  Includes the VP-T49G Video Collaboration Phone, 48S IP Phone, 48G IP Phone, 46S IP Phone, 46G IP Phone, 42S IP Phone, 42G IP Phone, 41S IP Phone, 41P IP Phone, and 40P IP Phone.