The MP-1803A 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. The MP-1803A Laser Pointer is the upgrade of MP-1800. Compared with MP-1803, it added a function of blinking fast and slowly. (Press the button, and keep it down, fast blinking spot; release it, slow blinking spot; press again, continuous spot; then press, turn off.)