Hotshot SL 50 USB Engineered to stand out day and night, the Hotshot SL(TM) 50 delivers nearly twice the output of the original Hotshot(TM) with powerful 50 lumen flashes. Exclusive 2 button design lets you fully adjust the tempo of each flash mode to maximize motorist awareness. Every bit the road cyclist&&';;s tail light, its power combines with an impressive 200 hours of run time to give you a large presence anytime and anywhere. (patent pending) Specs: - Powerful 50 lumens flashing - Built-in 24/7 Safety TechnologyA(R) gives you a powerful selection of 6 day and night modes (Steady - Zoom - SteadyPulseA(R) - Triple Flash - DayLightningA(R) - Random Flash) - Freely adjust the brightness of Steady mode and the flash tempo of the flashing modes with the simple 2 button interface (patent pending) - SteadyPulseA(R) mode features a steady beam to help motorists gauge their distance while overlapping pulses keeps them alert at night - DayLightningA(R) mode emits lightning-like flashes to highlight your presence in the brightest of daytime hours - Zoom mode signals those around you with gentle changes in brightness - USB rechargeable internal battery - Low battery indicator - Light mode memory saves the mode you&';re in before the light is turned off - Compact, water resistant design weighs only 55 grams - Seat post mount included - 2:30 ~ 200 hr run time