1.The pocket light of precision CNC machined aluminum case with knurled design 2.Anodized inside and out against corrosion 3.3 Watt LED delivering white luminous output much brighter than standard small single LED's , and Lamp life 10,000 hours 4.Reverse Polarity Protection and Current Regulating Circuit 5.Toughened ultra clear glass Lens with AR coating 6.O-ring sealed for dust and moisture protection 7.Water and shock resistant and push-button tail cap switch 8.AC power adapter (input 110V or 240V, output 4.2V 1000mA, with UL or CE approval) and External Smart Battery holder 9.Additional rechargeable battery