The method of use is as follows: 1, the front of the etc card faces the driver, the back of the card faces the front glass, and the chip part is inserted into the obu device; 2, continuously insert and remove the etc card twice to open the Bluetooth function of the device, and then turn on the Bluetooth of the mobile phone and open the electronic label app applet at the same time;
3. After the Bluetooth pairing is successful, submit the photo of the front face of the vehicle according to the prompt, and wait for the approval to activate the device. etc is an electronic no-stop toll system that automatically tolls on highways or Bridges through dedicated short-range communication between an on-board electronic tag mounted on a vehicle's windshield and a microwave antenna in the etc lane at a toll station.