HIVIZ FASTDOT H3 is a unique low profile single dot sight system that combines both fiber optic and tritium for 24 hour illumination. Red front sight, green rear sight.Low Profile sight setFits: All Glock pistols in 9mm, 40 S&W, and .357 Sig.Sight visibility in all light conditionsUltra bright encapsulated TritiumAll steel constructionFits standard holstersPatented technologyHIVIZ Tritium illuminated sight warranty information HIVIZA(R) Tritium sights are covered for a period of 12 years according to the date stamp on the product against tritium failure resulting in total loss of illumination due to defects in the workmanship or material during normal use. The original owner is entitled replacement of the entire sight pending inspection for misuse. This warranty does not cover failure due to damage that is the result of abuse, or accidental or improper use and or damage resulting from improper installation methods. Important Notice: This product contains tritium gas "H3" and is regulated by the US NRC. The Purchaser is exempt from any regulatory requirements. Do not attempt to disassemble the sight.