Moon Ring, USB Rechargeable, LightsThe 15 chip circualr ring COB high brightness LED make this a unique front light with great side visibility, and CNC aluminium heat sink casing makes it rugged and water proof(IPX4). Rechargeable lithium polymer battery 3.7v / 280 mAh, USB rechargeable and with Low battery, cahrging & fully charged indicator as well as Automatic fully charged cut off system. Quick release patented univesal bracket fits all round and aero bars