The USB (Universal Serial Bus)-rechargeable Rapid X2 takes everything you love about the Rapid X & doubles it. Surface-emitting LED strips wrapped in Cat Eye lens technology now pump out 100 lumens up front & 50 lumens in the rear for unparalleled safety, day or night. The compact, lightweight body securely mounts almost anywhere, including round & aero seatposts, seatstays, handlebars & forks. For ultimate versatility, the optional Spacer X allows the Rapid X2 to mount to our standard Flex-Tight bracket, rear rack bracket, saddle rail mount, clothing clip & Fizik saddle bracket. 6 modes allow you to choose the light pattern best suited for your riding environment, superior side visibility means they'll see you coming from any angle & Battery Auto Save feature ensures you'll never get left in the dark. Specifications: COB LED technology Li-Polymer battery Up to 100 lumen output 360 degree visibility Complex circuitry allows safe charge & discharge USB (Universal Serial Bus) recharge (3 hrs) O-Ring attachment Battery Auto Save (auto flash) Low battery indicator Light mode memory 5 Modes: Constant / Flashing / Rapid / Pulse / Vibration Runtime: 1–30 hrs depending on mode Dimensions: 74.4mm x 30.5mm x 33mm Weight: 30.5g