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Laser Bike Rear Ligjht 1.Environment-friendly materials, lightweight and durable. 2.Silicone bracket for easy install and quick remove. 3.With laser line function, can use as a laser pen, play with your pets. 4.IPX-5 waterproof, can normally used in rainy days. 5.Built-in 3.7V 500mAh battery, USB interface, easy charging. Function: 1.LD laser line and LED Tail light. 2.LD, LED independent switch control with USB connector. 3.LD working mode: slow flash-fast flash-keep bright. 4.LD working mode: LED light up one by one. flash in cycle keep bright. 5.Quick release handle bar mount: fits for 22-35mm. Performance: 1.If LED and LD work at the same mode together: 2.5 hours for keeping bright, 5 hours for fast mode, and 7 hours for slow mode. 2.For recharge, the light is red, When charging is over, the light will be green. For discharge,the green light on;When voltage is lower 2.7V, the light become red ,When voltage is lower than 2.6V, LD function off,but LED still work as normal,When voltage is lower than 2.5V, start battery protect