Compact USB rechargeable front light with 100 lumens brightness. Aluminum alloy; Cutting Luminous flux: 100 Lumens, Luminous Intensity: 660cd; Illumination: 6.2Lux/10M 3W White LED; 1 x Lithium Ion Polymer Rechargeable Battery; Built-in DC 5V/0.5mA); Can be charged without worrying about the memory effect. Can be charged via the USB port of your computer. Charging time: 2 hours Low battery indicator; 4 modes of lighting: 4 hours, high brightness lighting: 1.5 hours, pulse light: 7 hours, flashing: 18 hours, USB cable x 1 included Mountable diameter: Φ0.7 - 1.9 inches (18 - 48 mm), L 2.1 x H 0.8 inches (29 mm) (20 g) (35 g), product color may differ from the actual product depending on the type of display type. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce. Please be aware of