Questions about Razer Ornata V3

It has a dedicated play/pause media button. These are located at the top right, above the numeric keypad. Lighting is not customisable for individual keys, the keyboard is divided into zones, allowing you to programme different lighting effects.

ß, no é, etc

According to my research, the cable is 2 meters long.

No, the Ornata V3 unfortunately does not have any internal memory. Any configured colors/patterns are only available while plugged in to a PC with Razer Synapse installed, or a similar software, such as OpenRGB. While not configured through Razer Synapse etc., the keyboard defaults to slowly cycling through all colors. The only thing you can change directly on the keyboard is the brightness of the lights.