Durable, anodized machined aircraft aluminum construction; Removable, multi-directional pocket clip; Multi-function push-button tail switch; Unbreakable polycarbonate lens; Lithium ion battery recharges in 4 hours; Recharge by plugging into USB port, optional AC or DC adapter, or Streamlight's EPU-5200; Sliding metal sleeve protects USB port; Fully regulated output for consistent lumen performance over the battery life; IPX4 water-resistant; 1 meter impact resistance tested