... slide for you. Function1,Page up :Double-click the button, it works as "page up" key on the ... keyboard; 2, Page down : Click the button, it ... as " page down" key on the keyboard; 3, Laser pointer: Press the button about 1 second to emit ... handle2, Receiver can be stored into transmitter3, Warranty period: 1 year4, International standard met: CE, FCC, FDA , ...