Cygolite Streak 350 USB Rechargeable Bicycle Headlight Powerful 350 Lumen USB rechargeable light with 6 modes; 1:30 to 100 hour Run time Exclusive night and day modes provide enhanced safety (high, medium, low, steady Pulse, daylighting, and walking modes) Steady Pulse alerts with pulses as its overlapping steady beam lights the night; daylighting's powerful flashes highlights your presence in day light Low battery indicator alerts you when a charge is needed; water resistant design only weighs 90 grams Cygolite, the trusted American bicycle light experts since 1991