Now you can boost your visibility from behind with the NiteRider Sabre 50 Tail Light. 50-lumen LED projects powerful red light and amber-colored side lights alert motorists to your presence day or night. There are three steady modes and three flash modes that provide 1:30 - 7:30 hours of runtime. It's USB rechargeable in only 1:30 hours and has a low battery indicator to let you know when more power is needed. Streamlined design sits perfectly behind your seatpost without interference.