The RSP RX100 100 lumen front bike light is an excellent choice for any rider. 100 Lumen output Li Ion Internal battery USB (Universal Serial Bus) rechargeable 2.5 hour charge time Full beam 8 hours Silicone protective housing Flashing & constant modes Magnifier lens Low battery indicator Water resisitant Integrated bracket swaps form bike to bike with ease! The RSP light range uses all the latest LED & lens technology to bring you the highest performance lights at a great price.