1.The PHC-App is designed for the PHC-App 's scooter. 2.Through Bluetooth connection to the DanDan scooter,the APP can show the vehicle's power,speed,TRIP,ODO and so on. 3.The APP can also control the vehicle's power,switch machine,riding mode,etc.. 4.Connected to the vehicle,the APP records the vehicle's driving trajectory which provided by your iphone device(each 1 m scan a point).