The TL 5.0 SL has five ultra bright LEDs with four different operating modes, including three different flash modes. New for 2015, the amber Side Light help to provide even more visibility from the sides of the rider. The TL 5.0 SL will help keep you safe and seen from behind (180 degree visibility). The TL 5.0 SL operates on 2 AAA batteries (included) for up to 100 hours on flash