For the V2 Smart Controller, using an HDMI cable to connect to a larger monitor, the safest cable length is typically around 6-10 feet (1.8-3 meters). Going longer than that could risk signal degradation, especially if the cable is of lower quality. If you need a longer cable, look for high-quality HDMI cables rated for longer distances or consider using HDMI signal boosters or active cables to maintain signal integrity. It's also important to avoid using excessively long cables, as they could strain the controller's HDMI port or cause unreliable performance.