... and reasonable price 4.ISO,SGS approved Safty Bicycle LED lightDouble-LED,Super brightConstant mode/ Flashing modeDimension: 44*31*30mmProduct ... the buttom switch ordinally,both of LED light quick flashing simultaneously, the both LED light slow flashing simultaneously, both of ... according to your actual needs Sustainable use of both LED light 68 hours Sustainable use of flashing alternately for ...