Four ultrabright Nichia 5 mm LEDs, 30% brighter than standard LEDs. Current regulated for constant output. 4 output modes-hi, med, low and safety flash. Low battery indicator light. Weight: 3.4 oz. Max Lumens: 78|Max Burn Time: 105 hrs|Max Distance: 37 m|Waterproof: IP67|Power Source: 3 AAA|Tactical Quad: Adds built-in red lens that slides into place when you want to preserve your night vision. Turns on in low mode.