I purchased this here, but I'm selling it because I haven't used it much, only testing its functionality. It's a used item, so if you're looking for perfection, please purchase a new one. 【Installation】 Insert into the cigarette lighter socket. Match the frequency of your car stereo. Adjust the volume. The box has some discoloration. There is a manual. It worked without any problems when installed. Removed on February 6th. The items in the photos are what's for sale. The audio earphones are missing, but I think commercially available ones will work fine. If you'd like, I can include a commercially available one.