security invisable ink spy pen with ultraviolet uv multifuntional currency detec

this spy pen can be fun ,,cool mark your items with the ultra violet application,do secret messages tattoos,or just keep your goods safe.can be used on wood,body,wall,cloth, paper,etc watch it glow in the dark.powered by 3xag3 cells(included)also comes 3 spare cells silver in colour perfect stocking filler (enjoy )