Two 0.5 watt red LEDs by Nichia BrandThree modes: zZz, a-HA, Rock Steady and 10 percent power save functionUp to 50 hours run time on 2x AAA batteries (included)Weatherproof exterior for all season ridingIncludes bracket for seatpost or seatstay mountingWeight: 45gBlack/Red3RearNot PublishedUPC/EAN/GTIN: 812938014109