https://mediaconnect.com/radio-controlled-toys-tested-for-signal-interference

A principal cause of the interference detected was spurious emissions – signals generated on a frequency outside the necessary bandwidth. Another was radiated power – the strength of the signal of a transmitter in a specific direction.

Zu geringe Oberwellendämpfung und zu hohe Strahlungsleistung. Der Klassiker bei Chinakram und idR nichts super schlimmes, aber halt außerhalb der zulässigen Werte.