1) Product Size: 131mm X 32mm (head diameter) 2) Aluminum alloy material 3) 1 watt high power LED installed 4) High-intensity ultra-white light 5) Focus control 6) Shockproof and water resistant 7) Strong anodized finish 8) A wrist lanyard attached 9) Reliable rear push switch 10) Use 3AAA batteries (not included