1. Skid-proof Design 2. Reflector: Convex Lens 3. Internal wiring applies the high efficient booster circuit, working voltage is wide and can utilize the batteries in the largest extent. 4. Waterproofing design, "O" ring sealed. 5. Battery type: 1 x 18650 3.7v Battery or 3 AAA batteries(Not Include) 6. Super Bright, blinding Effect 7. Adjustable focus range for different usage