This product excellent characteristics: Modes:3 Modes (Normal，Strobe，Fast Strobe) Rainproof Double Laser Light1， Double bright red or blue or green 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.Package List:1 x Bicycle Light(without battery)1 x Holder1 x Box