High quality Transcend's dual USB car lighter adapter comes with one car charger with dual USB ports and 8m and 4m cables. Simultaneously power your front and rear dashcams while on the go. Installation guide: Route the cable to your car power outlet. Hide the cable along the headliner, windshield, trim, or rubber. Keep the cable out of sight for a tidy appearance. Connect the micro USB to the dashcam. Connect the type-A connector to the USB port of the car charger. Plug the car charger into the car power outlet to complete the installation.