True Interactivity for Bringing People Together. With differentiated cutting-edge touch technology, the TR3BF Series supports multi-touch and writing functions providing accurate drawing and authentic touch quality. In addition, the Air Class and web browsers support multi-directional communication and interactive learning, which will help you achieve the successful business. The TR3BF Series can simultaneously use up to 20 points of multi-touch and 10 points of writing, as well as 2 types of stylus pens. This function offers a lifelike board writing experience and makes collaboration much easier.