Note: Since the logistics rejects all items with batteries, we can only remove the battery from the remote control. After receiving the packaging, please purchase the remote control battery yourself, we apologize for this! The battery specification is CR2032 button battery. Q&A about the product: 1. What types of cars can be installed in this product? This system is universal and it can be used on almost any 12V car, Provided the car itself is not push-button start or knob start,But it requires profeional installation,Please install this car alarm with profeional installation shop, Or make sure that you know how to install it. If you have any questions, please leave a meage and I will get back to you soon. 2. Will my car become unsafe if I install this product? because it will lose its original anti-theft capability This product has the function of anti-theft, after the correct installation, when the vehicle is locked, it is impoible to use the button to start the engine in the car,this intelligent ignition system with a smart anti-theft function that exceeds even the car's own anti-theft 3. Will the ignition system malfunction and I won't be able to start the car? This product uses car-level relays and cables, which are stable and reliable in quality. Therefore, in general, please check the power supply of the car when the car cannot start. We all products have paed strict quality inspection and Make sure it works well when leaving the factory.