Topeak redlite race rear lighttopeak redlite race rear light2 rear facing super bright red leds provide excellent visibility rubber strap allows tool free mounting removal and multi mounting positions features lamp 2 super bright red ledsbattery cr2032 x 2 includedcontrol 2 modes constantblinkingburn time approx 70 hrs140 hrslight output 15 cdlamp housing injection molded plasticmount fits seatpost and seatstay 25 4 34 9mmsize l x w x h 7 x 36 x 38cm 28 x 14 x 15