Having your bicycle well lit provides you with the visibility required for other drivers to see you as well as allow you to clearly see the hazards on the roads. This bicycle lamp and is strong enough to survive any extreme sport that requires some extra light. Adopt aerometal CNC processing anodic oxidation surface treatment; Suitable for outdoor fishing hunting camping riding; Powered by 4 x 18650 batteries pack 2 in parallel and 2 in series (not included) DC voltage: 8.4V current up to 5A; Can be fixed on bicycle used as bicycle lamp; With elastic rubber headband.