Meprolight, a company famous for its immensely robust red dot sights, was founded in Israel. Their devices are used by the Israel Defense Forces, but have also gained in popularity among civilians. Meprolight is famous for using tritium in some of their devices. This self-illuminating radioactive element provides illumination at night, rendering the use of batteries unnecessary. Many red dot sights of theirs, including Mepro M21, lack a battery compartment for this reason. Meprolight revolutionized the industry when they launched tritium pistol sights. These make aiming simple in all lighting conditions.