... recognized by pens, ruler, protractor, set square, searchlight and other tools, and to page up/down, drag object, clone object, etc. Also ... to write, move, rotate, zoom in/out object and shift page, etc. with your finger instead of e-pen;Adopt ... interfacePower< 1W, < 200mAhTouch TypeSingle-touch, multi-touch gesture recognition/dual-touchUpgradeSupport by USB Welcome to us for cooperation.contacts ...