NiteRider Lumina 400 Bike Light 400 lumens for optimal visibility Run time: 1:30HR High-400, 3:00HR Med-200, 6:00HR Low-125, 21:00HR Walk-30 Light levels, 4 steady/1 flash Includes LED headlamp, internal Li-lon battery, USB charging cable, and handlebar mount-fits up to 31.8mm Weight: 172 grams