Serfas CP-600 Combo Light Set Headlight features 3 Nichea White LEDs, optical lens, and easy mount Taillight has 7 LEDs, rear rack mountable, and universal bracket mount Batteries inlcuded Burn times - Headlight: Steady = 35 hours, Flash = 50 hours Taillight: Steady = 60 hours, Flash = 100 hours Easy "no tool" installation