This little laser beam tail light will ensure your safety while riding in the darkness. It has 5 LEDs and 2 laser bulbs. The LED and the laser work independently depending on the mode you choose. This safety light can be mounted on 20-36mm seat post. The length and position of the laser beam varies with the angle you mount the lamp Features: 100% Brand New and high quality 7 kinds of flash mode: Always bright, flash, slow flash, left to right, right to left and left to right slow flash, flash, flash back and forth 2 laser lights remind someone else of keeping distance, add safety?This little laser beam tail light will ensure your safety while riding in the darkness. Note : Do not look directly at laser lights Water Resistant, safe in watery fog when riding in the rain, use for jogging, walking, bicycles, car emergency, horse-riding, animal collards or leashes, road emergency & camping, ETC. Specifications: Working: 9-36 hours depends on the batteries Power: 2 x AAA batteries required (not included) Material: ABS, Acrylic & Nylon Seat Post 20-36mm tube Input Power: 100mW 260 Degree Wide Visibility WARNINGS: AVOID Exposure directly to eye! KEEP OUT REACH OF CHILDREN! Pack Includes: 1 x Bicycle Laser Beam Rear Tail Light Lamp 1 x Bicycle Mount Retail Box.