It is not recommended to enable noise cancellation in quiet indoor environments, or to set the depth of noise cancellation to 10 or lower.
It is also not recommended to enable noise cancellation for musical instruments, as the noise cancellation feature may treat the instrument's sound as noise.
Noise cancellation adjustment method: The camera version receiver can set noise cancellation by pressing the menu knob - Mic settings - Noise cancellation. while the mobile version receiver can set it in the HollyAudio APP under noise cancellation.