1.Invisible Ink Pen with UV light 2.Battery: 2 x AG 10 3.Can be used as money detector pen 4.Product Size:132 x 10 x 9 (mm) Invisible Ink Pen with UV lightFeatures:1) An invisible ink pen2) When you write your message on the paper the message is invisibleyou must use the UV lightto read the message.3) Packing details:1pc/blister&card24pcs/display Battery:2 x AG 10Product Size:132 x 10 x 9 (mm) ...