This is a set of bike lights. They are USB rechargeable and really bright so very safe. There is a 500 lumen front headlight in white and a 180 lumen back tail light in red. They lights are designed to be used day and night to improve visibility to keep the rider safe. They have built in rechargeable batteries and come with USB cables so that they can be easily charged up and you will not have to buy batteries all of the time. They take 2 hours to fully recharge and will then last for 10 hours on the lowest light setting.