... oxidation surface treatment.Switchcap touch switch with voltage indicatorCapacity of battery:8800mAhVoltage4.2vWorking time3.5-30 hoursBattery life-span500 ... of led bikelights1) bikel ight: 1pc2) Charger: 1pcs3) Battery pack: 4pcs 186504) O-Ring: 2pcs5) Headlamp tape: ... More Info about Bike Lamp ? : ) AnniePackageAccessories Included:Battery Pack,Charger,O-rings,giftbox,Helmet mount,Headlamp tape, ...