Blackburn: TO-SEE AND TO-BE-SEEN High power BLITZ Daytime running mode and side visibility to grab the attention of cars or light your way through a dark section of the commute. High quality IP-67 submersibility sustains all the weather you can commute in. The DAYBLAZER 550 puts light where riders need it most and well powered to be seen.550 Max LumensTIR lens focuses a more powerful and far-reaching white lightSilicone swivel mount so you can adjust to the center of the roadMount fits handlebars from 22?35mm and straps to some helmetsAction-camera-style mount sold separately #7105045 MODE/RUNTIME:Mode/Runtime:Blitz: 1 hour at 550 lumensHigh: 1.5 hours at 275 lumensLow: 5 hours at 75 lumensPulse: 5.5 hours at 100 lumensHigh: 12 hours at 65 lumens