TOP YAO High Quality 5led+2laser Cycling Safety Bicycle Rear Lamp Waterproof Bike Laser Tail Light Headlight Warning Lamp Flashing 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 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 Compact Body Type (Weight 61 Grams), Professional Design Allows You To Fully Experience The Joy Of Travel Jane LRT Line!