You can do this using only more advanced technology. Many have already thrown this gate checkpoint)) Look here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-C4WYzF3y3AU.html How it works: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ES1007tYMGg.html