Best selling rechargable The new standard in urban bike lighting. The USB (Universal Serial Bus) rechargeable Volt 150xc delivers a constant 100 lumen output to see by & flashes at an ultravisible 150 lumen when you really need to be noticed!USB rechargeable front light with up to 150 lumen output Integrated Li-ion battery Side visibility USB recharge Flextight handlebar bracket Modes: High / Low / Flash Runtimes: 100lm: 2 hrs 30lm: 6 hrs. 150lm: 30 hrs Battery auto save Low battery indicator Light mode memory Weight 42g