You must have seen that there is a small speaker in the package box.And you must have been asked that whether your car has AUX or not?If you have installed the car DVD player you will know the answer and know about the use of  the small speaker.Or you may have been  puzzled by the AUX.Because it closely connects with the sound of the head unit .Just in a word:You can’t make the car DVD Sat Navi  make a sound without the AUX.At the same time,the small speaker is for the sound of the GPS and Bluetooth of our unit.So they are a team and they can’t work normally even the absence of anyone.Now you have known about some of the use of the small speaker and AUX for Car Nav head unit,haven’t you?In most occasions, the unit will use your original car’s speakers.In general,you just need install the car radio unit correctly step by step.The problem is that many people usually don’t know how to operate them.Especially to those who have just got a car.They are freshmen to the popular and advanced car DVD machine.

The effect of the car DVD player is really great.

Now I will teach you how to confirm whether your car has AUX.Please go to the menu “entertainment” of your original CD’s screen,and then click “entertainment” to check if there is AUX there.Also you can check if your car have AUX port which there is a sign of “AUX” button.The position of the sign is different according to the car model.If you don’t have get a car radio head unit like this and you are curious about it,you can click the video bellow.The big surprise will make you happy all day.

We have had a detailed understanding to AUX.Then I will say something about the small speaker.As I said above,The Car Nav machine will use the original car’s speaker.Only under the condition that you are using the GPS or Bluetooth of our unit and  the radio or CD function of your original car in the background, the sound of the GPS will come from the small speaker and the sound of the radio will come from your original car’s speaker. If you don’t want the sound of the GPS to come from the small speaker while using your original car’s function in the background, you can switch to our interface completely and then all the sound will come from your original car’s speakers. So, the audio from GPS, phone call, audio will still come from your original car’s speakers.If the page have solved your puzzle or problem,I will feel happy to have help you.But if not,don’t worry,you can contact with us at any time and any where. Seicane will help you as soon as possible.