The FiiO X7 MARK II is a portable digital audio player that features a modular design, allowing users to swap out its amplifier modules for tailored sound to suit various headphones and listening preferences. It supports high-resolution audio formats including DSD, PCM, and MQA, ensuring a detailed and dynamic listening experience. The device has a robust build quality with an aluminum chassis and a high-definition touchscreen display for easy navigation through the music library. The X7 Mark II is equipped with a powerful dual DAC setup featuring AKM AK4495EQ chips, coupled with a high-performance headphone amplifier for improved audio output and fidelity. It supports Bluetooth connectivity, enabling users to stream music wirelessly, and has Wi-Fi functionality for streaming services and firmware updates. The X7 Mark II also includes a variety of input and output options, such as balanced and single-ended headphone jacks, making it versatile for different audio setups.