About the Moon Cerberus Rear Light This Rear light combines the technology of the Comet X (Now with three LED strips) into a 270 degree performance light. Fully Compatible with all styles of seat post, this is the ideal companion to any bike. Key Features Light Source: 3 RED COB LEDs Brightness: 50 Lumens Constant 150 Lumens Flashing Run Time: 140Hr Max Run Time Charge Time: 2 Hr Recharge Time Day Light Flashing Lock System Light modes -Auto Safe Mode -Day Light Flashing -Lock System Lighting Buying Guide