FEATURES: 1.Ultra tiny and lightweight, you can carry iton your key chain or hang on your neckfor everyday use. 2. Made of aluminum alloy body, it’s tough and stunning with multiple color options. 3. Powered by three LR44 button cell batteries. 4. The head mechanical rotary switch is strong, wear-resistant and easy to operate. (1)LED SPECIFICATIONS: Brand & Model: Highpower 3W LED Max Brightness: 100 lumens Throw Beam: 46 m (2)CIRCUIT SPECIFICATIONS: Output Level: one mode (constant lighting) (3)BATTERY SPECIFICATIONS: Power Source: 3*button cell batteries Burn Time: 168 hours (4)PHYSICAL SPECIFICATIONS: Size(mm):31.8(length)* 15(body diameter) Weight(g): 11(excluding batteries) Switch: Rotary mechanical head switch (Rotate the head tightly to turn on, loosen the head slightly to turn off.) Material: made of durable aircraft-grade aluminum T6061 Lens: special optical lens Treatment: polished finish Waterproof: IPX8 Anti-dropping height: 1.5 m