The YD164 5-LED 7-Mode Rhombus Warning Bicycle Tail Lamp Rear Light emits super bright red light in the dark， letting drivers and cyclists know you are on the road. It is built with 7 lighting modes to satisfy your various needs， including steady on， fast strobe， slow strobe， fast strobe one by one， slow strobe one by one， and more. Waterproof construction ensures its high performance in wet conditions. Powered by two CR2032 batteries， it offers up to 40 hours of continuous working time. And it is easy to install with the rubber ring on the back. Click and order now!                                    Features             Emit super bright red light in the dark to guard your road safety<br> Built with 7 lighting modes to satisfy your various needs<br> Waterproof construction ensures its high performance in wet conditions<br> Powered by two CR2032 batteries， offer up to 40 hours of continuous working time<br> Easy to install with the rubber ring on the back<br> Compact and lightweight， won’t add extra burden   <br>                                                            Specifications             Material     Plastic & LED Strips    <br> Color     Red    <br> Battery     CR2032    <br> LED Lifespan     100000 Hours    <br> Dimensions     (2.36 x 1.38 x 1.18)" / (6 x 3.5 x 3)cm (L x W x H)    <br> Weight     0.71oz / 20g     <br>                                                             Package Includes            1 x Rear Light <br>