This kind of LED Light for Bicycle gives you the excellent brightness in the dark or in strong backlighting with this long-lasting LEDs that features color balance. The LED light fits easily on to your bike and give you extra safety while cycling at night. The lamp holder side is transparent with aura， which can shine and make cycling more secure and smooth. You don't need to worry about in the rainy day for its waterproof features.                                    Features                New and high quality<br>    Easy installation<br>    With waterproof design<br>    Energy - saving and environmentally friendly， high brightness<br>    Seismic， impact resistance， non - thermal radiation， safe and stable， reliable<br>    Light source adopts solid high power LED<br>    Brightness shine as high as 100 lm above， irradiation range of up to 100 meters above， use life for 100000 hours， lighting time 120 ~ 300 minutes<br>    Because the torch light is too strong， Please do not to illuminate the human eye<br>                                                            Specifications            Bright Degree    The first gear strong light frequency ≥240 lumens<br>The first second gear weak light ≤120 lumens<br>The third gear high frequency flash 10 HZ / S    <br>The Light Bulb Life    100000 hours    <br>Electric Pressure    3.6 - 4.81 V    <br>Electricity Pool    3 quarter 7 battery / 1 quarter 18650 rechargeable batteries (need to lengthen tube)    <br>Product Specification    Full - length: 11.4 cm; Lamp holder diameter: 3cm; Tail lamp diameter: 2.7cm    <br>Package Size    11 x 4 x 3.8cm    <br>Weight    105g / 3.70oz    <br>                                                            Package Includes                1 x Q5 Strong Light Flashlight Dimmer Focus Bicycle Headlights<br>