The Blaupunkt Heavy Duty Series meets these requirements in both the 12-volt and 24-volt segments. A CD drive protected against shocks and vibrations allows for unrestricted music enjoyment even off the beaten path. All modern USB media can be easily connected and played. With fewer and larger rubberized station buttons, operation is always intuitive. The thoughtful design extends to the smallest details: saved radio stations remain intact even if the vehicle's battery is disconnected during maintenance.