Robust and light weight aircraft grade aluminum throughout. One piece precision machined for maximum strength. Hard anodized finish for wear resistance. Compact dimension 3.05" X 1.06" X 2.07" and light weight. Universal clampon mounting deck to fit most tactical pistols with or without rail slots. Tail cap ambidextrous rotary on/off switch. Instant spot focus for clear object identification. Instant spot focus for clear object identification. Aim and brightly illuminate simultaneously to enhance shooting accuracy. Two 3volt lithium batteries included. Superbly designed with great shock resistance. Excellent water resistance. Optional remote pressure switch available