IMPROVE YOUR SAFETY: The rear light can be tied on the bike seat back, and backpack as a warning tail light, helping other riders, drivers, and walkers spot you, to improve visibility and in the dark or at night.. and DURABLE: This bike tail light is made of silicone. Size: 14CM5.5CM, Power: 2CR2032 button battery(included). Flexible, durable, crush-proof, shockproof. Can be used on rainy and snowy days, or other bad weather..WIDE APPLICATION: The bicycle back lights are suitable for MTB, battery bike, racing bike, folding bike, motorcycle, or backpack, camping, hiking, room, party and decorations..EASY TO INSTALL: No tools are needed. Press the switch to turn it on. With 3 light modes: Constant light, Slow flashing or Fast flashing. You can be easily seen in fog, dusk, night, and dawn..PACKAGE INCLUDES: 1 LED Bright Lovely Heart Design Bike Rear Light. Easy storage. for , boys, girls, teenagers, and adults on Birthdays, Christmas and many occasions. Let you and your bike more daz.