Features: 1.Applicable Model: The inactive speaker activation harness is a replacement for Tesla Model 3 2018?2020, please check the model and year before ordering. 2.Activate Speakers: The original car can only use 8 speakers. With this wire harness, you can activate the 4 inactive speakers on cars. Give you more wonderful music enjoyment. 3.Practical: Give your ears a better listening experience and enjoy the pleasure of being surrounded by music, with stable data transmission and lossless sound quality. 4.High Performance: The wiring harness does not require additional processing, with thicker wire, low resistance, better sound effect, and safe to operate. 5.Non Destructive Installation: It is designed according to the original car interface, and can be inserted directly into the interface. Installation is simple and without any damage. Specification: Item Type: Inactive Speaker Activation Harness Material: ABS Fitment: Replacement for Tesla Model 3 2018?2020 Note: The power must be turned off before installation, the co pilot window will be minimized, and the door cannot be opened or closed during this period.