Topeak redlite aero rear lighttopeak redlite aero rear lightslim aerodynamic tail light fits seatpost or seatstay perfectly rubber strap allows tool free mounting removal and multi mounting positions features lamp 3 super bright red ledsbattery aaa x1 includedcontrol 2 modes constantblinkingburn time approx 40 hrs80 hrslight output 20 cdlamp housing injection molded plasticmount fits seatpost and seatstay 25 4 34 9mmsize l x w x h 66 x 24 x 34cm 26 x 09 x 13