ViewStylus ACP501 compatible with ViewSonic ViewBoard, iPad, and other capacitive touch screen devices. It allows you to do note taking, detailed writing, capturing ideas without any restrictions.ViewStylus ACP501 special technology empowers you enjoy natural pen-like feel.And our intuitive design makes it all easy. It's ready to use, no Bluetooth pairing or driver needed. All of the design are for letting you keep the fluent working flow.