Lumintrail All-Aluminum Compact 300 Lumen USB Rechargeable Side Illumination Bicycle Headlight with Integrated Li-ion Battery (Silver) Super bright 300 lumens using Cree X Lamp LED Side illumination for added visibility Runtimne: Lasts up to 10 hours on a single charge (at low output) Totally 8 modes. 4 light modes: Turbo &gt; High &gt; Medium &gt; Low, plus 4 strobe (flashing) modes: 1HZ-3HZ-9HZ-SOS. Material : CNC aircraft aluminum