1. What does the K3 indicator mean?

A: The K3 uses RGB indicator; the USB power plug in, the power switch  turn on, and red or yellow may be displayed in the non-playback state;
The current audio quality can be indicated only in the normal playback state:
1, blue ≤ 48khz sampling rate(<44.1kHz sampling rate not support
2, yellow >48khz sampling rate
3, green DSD format