With the ability to charge from a USB port, the Blackburn Flea Rear Light is perfect for commuting to the office. Ultracompact rechargeable Li ion taillight. Four superbright red LEDs. USB smart charger. Flexible and compact mounting system. Steady, flash, and chase modes. 6 hr. steady, 12 hr. flashing run times. LED charge indicator lets you know how much power is left. Due to federal shipping restrictions regarding products containing lithium batteries, this product cannot be shipped to Canada, Hawaii, Alaska, Catalina Island, Puerto Rico, APO, FPO or international addresses. Thanks for your understanding.