"The Meprolight ML11766 Tru-Dot Green Fixed Night Sight Set for Smith & Wesson Full Size, Compact 9mm, .40 Caliber Pistols offer the best low light performance of any night sights. It gives the shooter's three self-illuminated dots aiming reference, identical appearance and consistently located under all light conditions. It is renown for its quality performance. It is used and trusted by military personnel and law enforcement officials.It offers a handgun sighting system for improved rapid instinctive aiming which requires no transition from day to night use. It adds no weight and occupies zero space - a critical concern in external pistol sight design. The night sights withstand prolonged immersion in commonly used solvents and cleaning compounds.|Self Illuminated light source - No batteries or switches, always ready when you need them|Operates under all weather conditions|Totally integrated day and night sighting|Maintenance free|Can be mounted directly with no weapon modifications|Tests by marksmen show an increase of over 85% in hit capability"