I purchased this on Amazon and used it for about a year. The original holder broke, so I replaced it with the same one. Therefore, the base plate and double-sided tape are unused and included. There are no missing accessories. Both the base's double-sided tape and the magnet securely held the device in place, and it never shifted during driving. The quality is high, the main body rotates 360 degrees with a clicking sound, and the arm has a wide range of adjustment, giving an excellent impression.