A 2-in-1 USB rechargeable light that combines the front and rear light with 140 lumens. For use on the top of the helmet. Headlux Dual USB Specs: Injection molded polymer Luminous Flux: 140 Lumens (Front) 2 White LEDs (Front), 2 Red LEDs (Rear) Built-in Lithium Ion Rechargeable Battery (DC 3.7V/680mAh) USB Rechargeable, Charging Time: 2 hours Low Battery Indicator: 3.3 hours Illumination: 5.5 hours Flashing: 3 hours Front ) / Flashing ( Rear: 28 hours Waterproof Performance: IPX6 Rubber Strap for Helmets, Includes 1 USB Cable (L x W x H): 2.7 x 1.7 x 0.8 inches (69 x 44 x 20 mm), 1.4 oz (40 g), The color of the product may look different from the actual product depending on the type of display. 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