Portable ultrasonic interactive electronic whiteboard CE,FCC,RoHS,ISO9001, ... <0.5W Positioning Accuracy 0.1mm Input Electronic pen Response speed 3 m/s Resolution ratio ... : 10~80%AccessoriesUser manual, electronic pen, battery(LR6AA), Changchun Jida Scola Co.,Ltd has a strong R&D ... team,welcome you to cooperate with us for OEM or ODM service. Portable IR-ultrasonic electronic ...