Things buyers must know: 1. The equipment must be connected to the correct power source. The acceptable voltage range of this system is 8-20V. If the voltage is too high or too low, the system will not work properly. 2. This system is universal and can be installed in almost any 12V car, but it cannot work with the original push button start system of the Vehicle Interior Caritself, or the central door lock with double pulse unlocking, or the pneumatic door lock. 3.The models with mobile APP in the picture all have Bluetooth. These models can use the APP to remotely control the Vehicle Interior Carto lock/unlock/open the trunk/start the engine. The models without the APP in the picture have no Bluetooth remote control function. Please choose according to your needs The correct model, the kit is as shown in the picture. 4. Installing this system requires some professional automotive electronics knowledge. Please read the product manual carefully. Please pay attention to output signal cables must be connected to the correct signal according to the + or - on the product manual. Wrong connections may cause short circuits or burnout of the product. 5. All products have been strictly inspected before leaving the factory to ensure that they are complete and working properly.