Knog Blinder Road 250 Bike Light Twin Pack Front 2 LEDS generate 250 lumens for 1000+ meters of visibility, Rear 3 LEDs generate 70 lumens for 1000+ meters of visibility Target Run Time (hrs.): Front 1.5 -5.5, Rear 3.5 Steady, 20 Eco Flash USB Charge Time: 5 hours Beam Angle: Narrow 15, Wide 22 Short strap fits 22-28mm bars, Long strap fits 29-35mm bars