Material Type : PolyesterOrigin : Mainland ChinaCN : GuangdongColor : 2 color as showPackage Included : 1 set Warning LightFeature : Flash to warn you at nightFeature 2 : For HelmetFeature 3 : For BackpackFeature 4 : For Bicycle MotorcycleBattery : 200MAH chargeable lithium batteryWorking range : 2.6V-4.2VExecutive standard : Q/CBSTKD002-2017Material : ABSModel : Safety Signal LightFeature: 3 Modes can be selectedEffective voltage: DC 2.6V-4.2VEffective temperature range: -10~+60CMeter weight:Around 60 gMeter standard:Q/CBSTKD002-2017Installation ExampleThe Warning Light can be installed in anywhere you like.The interior of this product is composed of batteries and wires, which can make a slight sound when shaken. This is a normal phenomenon and not a quality issue