Contoured housing securely attaches to weapon; White LED, impervious to shock with a 50,000 hour lifetime; 100 lumens; 89m beam distance; runs 1 hour (LED only); Push-button switch on both sides for easy operation for right or left-handed shooters; Batteries can be replaced while light remains mounted on gun; Uses two CR1/3N lithium batteries (included); Durable, impact-resistant polymer construction; 1m impact resistance tested; Serialized for positive identification