Cycling Balls Tail Silicone Light Creative Bike Waterproof Bicycle Seat Back Egg Lamp Night Riding Cycling LED Red Warning Light Power supply：2* 2032 batteries（Not included） Silicon Waterproof Rear Tail Lights Boost your visibility and add some humour to the daily commute A swaying silicone ball sack that emits a bright red glow Turn them on/off and change light modes with a gentle squeeze Water/splash resistant construction Cable tie included to prevent theft NOTE 1.As different computers display colors differently, the color of the actual item may vary slightly from the above images. 2. Please allow 1-3 CM differs due to manual measurement. Thanks for your understanding. Specifications: [Appearance]: Love-type riding taillights (single) [Mode]: Always on/Burst Flash/Slow Flash/ [Energy]: Two 2032 button cell [Size: length 14cm width 5.5cm [material]: silica gel [light source ]: LED [Net weight]: about 70g Package Included: 1*Bike Tail Lights (Not included battery)