... ISO,SGS approved Safty Bicycle LED lightDouble-LED,Super brightConstant mode/ Flashing modeDimension: 44*31*30mmProduct Weight :22gCrystle Packaging ... the proper polarityDo not forget to turn off the switch after useRemove the batteries,when you are not using ... used as warning taillights One-Touch switch design, easy operating Multistage switch mode,press the buttom switch ordinally,both of LED light ...