1. Tailcap rubber switch 2. Water proof and shock proof 3. CMOS chip Regulated Circuit 4. Runtime: 4/2 hrs ( good battery) 5. Distance: Over 60 m/ 130 m 6. LED life: Over 50, 000 hours 7. Type 3 Hard Anodization for Extrenme Corrosion and Wear Resistance (option); 8. Precision Machined Aircraft Grade Crush Resistant Aluminum; 9. Low Heat-Energy Efficient Durable Diodes (LED only ) 10. Battery type: 2pcs 3V CR123A lithium battery 11. Bulb type: 1Watt/3Watt white light LED (imported) 12. Light output(Luminance): 25-30 lumens/ 50-60 lumens 13. Color: Silver or black