⚠️❗️MUST READ: Wrumer only works best if you connect your phone to the speakers over AUX. This ensures minimal delays. Universal AUX to USB C + Lightning cable included in the box. If you connect your phone to the speakers over Bluetooth there is a high chance you will experience a high delay. ⚠️❗️ Wrumer is a device that plugs into your car's OBD2 port and plays engine sounds through the speakers. Wrumer plugs into the car's OBD2 port. Through OBD2, Wrumer can access data, such as live RPMs and throttle activation. The Wrumer app connects to both the Wrumer device and your car's stereo system. It analyzes the real-time data from the engines and simulates enhanced engine sound through the speakers. Wrumer works with all non-electric cars with an OBD2 port. Currently doesn't work with electric cars.