This product stopped charging after 2 weeks of use. It was being used to power a safety light for me while cycled the length of the UK. Having it die was not only inconvenient but increased my risk on the road. I called customer service twice with no response. When I emailed customer service they simply stated products are only warrantied for 2 months (I had bought the device 3 months ago). What poor customer service, poor product, and overall waste of money and time dealing with the company.