Software features: 1. Smooth writing without any breakpoint or sharp curve (even when you Draw randomly and fast with the mouse); 2. Fast erasion without any trace of marks (even when you draw randomly And fast with the mouse); 3. Smooth running of the computer and software with cpu occupation Percentage less than 15%; 4. Unique teaching mode synchronizing the traditional functions of blackboard; Design mode, annotation mode, screen mode to satisfy diversified demands; 5. Extraordinarily powerful ppt import and export function without changing Physical size ú¦ 1470mm(width) x 1290mm(height) x 40mm(thickness) Packing size ú¦ 1754mm(width) x 1430mm(height) x 130mm(thickness) Weight ú¦ 30kg