Specifically designed for long-term operating applications, such as teaching in classroom etc. - based on patent hikey technology, teachers can use any function, writing, labeling and editing multi-media courseware with most convenient operation. - with durable multi-polyester coat surface, it can be used as ordinary whiteboard ¿c writing with dry-marker, and easily cleaned. - board height is adjustable for different grades of kids. - single cable connection, no ac required. - 60", 80", 100", 120" and customized size Specifications Model no. Tb-660 Tb-680 Tb-6100 External size 127íß 99íß 1.8 (cm) 166íß 127íß 1.8 (cm) 216íß 127íß 1.8 (cm) Diagonal 160cm (63í¦) 209cm (82í¦) 250cm (98.4í¦) Writing surface 120íß 92 (cm) 159íß 120 (cm) 209íß 120 (cm) Active diagonal 151cm (59.4í¦) 199.5cm (78.5í¦) 241cm (95í¦) Weight (wall-mount included) 15.5kg 28.5kg 33kg Digitizing technology Electromagnetic sensing Handy intelligence key Hikey i + hikey ii Resolution 8192 íß 8192 Process speed 480 frame/s Transmission speed 19200 bps Usb cable 10 m Pen 2 pieces Installation Wall mount bracket / mobile floor stand (optional) Interface Usb1.1¿c 2.0 Power consumption Less than 1 watt Warranty 5 years