Pharos 150 COB (Chip on Board) LED (light emitting diode) safety bike tail light. LEDs are intergrated into one single unit which gives the apperance of brighter light and a wider beam angle. Pick from 8 super bright modes to make sure you are visible on both day and nighttime rides.The silicon mounting strap mounts the light on just about any seat post and can be mounted vertically or horizontally. No tools needed for installation. Features a wraparound lens design to give you both side and rear visibility for bonus safety. 30-lumen light output. USB (Universal Serial Bus) rechargeable for convenience. Run time 1.5 to 30.5 hours depending on modes. 3-hour charge time.