The Moon Pulsar Rear Light is a standard battery powered rear light which is great at keeping you visible on dark or day time rides. With 5 different modes, offering up to 25 lumens, you can choose how to be seen. It’s compact and easy to fit with a quick release universal bracket This Moon rear bike light also offers you a 300 degree total light angle to deliver side visibility for increased safety. The 5 different modes allows you to get the best light for you ride offering you both static and flashing options with up to 115 hours of battery life. Moon Pulsar Rear Light Features BK-21 (Belt clip) 1 pc (15 chips) COB high brightness red LED 2 x AAA alkaline batteries 5 modes: High / Over drive / 50% Flashing / 100% Flashing / Strobe Quick release universal bracket RB-22 (fits all round bars and AERO style bars) 2 O-rings for mounting: RS-G (fits 20-35mm diameters); RS-H (fits 35-52mm diameters) Side visibility Water resistant (IPX 4) Size:65.5 x 27.5 x 20.5 mm Weight: 38g Mode High: Lumen 12: Run time 68 hours Mode Over drive: Lumen 25: Run time 43 hours Mode 50% Flashing: Lumen 12: Run time 150 hours Mode 100% Flashing: Lumen 25: Run time 110 hours Mode Strobe: Lumen 15: Run time 115 hours