The MP-1680 Laser Pointer is your ultimate partner for State-of-the-Art presentations. Produced with advanced optoelectronics, designed fine, checked strictly, can give you years of reliable service. The MP-1900 Laser Pointer is ideal for use in presentations where various equipment is used, such as slide projectors, TV projectors, LCD panels, film projectors and so on. MP-1680 is an old product manufactured for many years. Sandblasted copper shell, covered with nickel, beautiful appearance, classical design, and high customer loyalty. So it?s sold well all the time.