This product excellent characteristics: 1 double bright red laser line protection for your escort lines， draw your exclusive lanes. 2 Laser Safety tail lights with international safety standards Class IIIA level but do not direct the eye. 3 five LED lights are really bright LED lamp， brightness， super good. (Multi-mode switch) 4. anywhere at any time convenient to replace the battery. 5 special sturdy adjustable buckle， strong elasticity， impact resistance， (generally applicable to 20-33mm in diameter seatpost). 6 By IPX2 waterproof standard， tilt 15 degrees raindrops waterproof. Allows you to change the status quo.