Expandable storage for music: up to 32 GB capacity, compatible with TF cards and USB drives for offline playback without relying on network access. This lets you carry and play a larger library wherever you go. Easy and comfortable to use: user friendly design with a large display and a convenient rotary control. The setup requires no external power source, enabling simple operation and reliable access while you drive. Safe protection for vehicle and devices: intelligent voltage detection provides continuous protection for your car electrical system and connected equipment while driving. The hands call wireless receiver supports safe, hands communication. Seamless wireless connectivity with your car stereo: wireless transmission lets you link your phone to the car stereo for quick song changes, call answering, and volume adjustments, enhancing incar listening and communication. Use scenarios Long road trips: bring a large offline music library via USB or TF card and enjoy uninterrupted playback without buffering or data usage. Daily commuting with hands calls: pair your phone to the car stereo, manage music and calls with the large display and rotary control, keeping both hands on the wheel. Shared family vehicle use: multiple devices can connect wirelessly for easy music control and hands calling, improving convenience and safety on family trips.