To connect the 5K monitor to a MacBook Air M4 without loss of quality, you need a USB-C cable that supports DisplayPort Alt mode with full 5K bandwidth and is ideally Thunderbolt 3 or 4 compatible. The cable must be able to transfer high data rates (at least 40 Gbit/s) in order to display the 5120 x 2880 pixels at 60 Hz without compression.

The monitor offers USB-C connections with DisplayPort support and can transmit image signal, power supply (up to 90 W) and USB hub functionality via a USB-C cable. For a lossless 5K connection, you should use a high-quality USB-C cable that is explicitly certified for Thunderbolt 3/4 or USB-C with DisplayPort 1.4. Normal USB-C cables without these specifications cannot guarantee the full resolution and refresh rate.

To summarise:

- Use a USB-C cable with Thunderbolt 3/4 or USB-C with DisplayPort 1.4 support.
- The cable must be able to transfer high data rates (at least 40 Gbit/s).
- Make sure that the cable is certified for 5K resolution at 60 Hz.
- The MacBook Air M4 supports USB-C/Thunderbolt, so a suitable cable is required.
- The full 5K resolution cannot be achieved via HDMI or simple USB-C cables.