Highlights Flash Function: The super bright LED & Laser beam can be opened at the same time Laser beam ensures your safety when you riding at night LED is as bright as the streetlamp & distinct visibility is more than 1 mile; With strong holder, & firm PC cover to ensure LED light can be used for long time (more than 100, 000 hours); Red LED of safety function: can switch to 3 modes via press the ON / off button;2 crossing functions: Constant on & Flashing Stable & anti-shock. Specifications Shipping Weight (kg): 0.5 Dimension (cm): 3.8 x 4 x 4 Package Contents 1 Bicycle Laser Beam Rear Tail Light;2 Rubber Holder Sticker;1 PC Holder;2 AAA batteries;1 Screwdriver.