Is my ESC switching or Linear type?

I have a Hobbywing Skywalker 20A esc. I think it might be a duplicate version. Forgetting that, Could someone tell me if it is a switching BEC or a linear BEC please? I couldn't find any relevant data sheet from the manufacturer website.

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ESC configuration problem - Beeps!?

I have a skywalker 20A ESC connected to LD power 750KV motor. The ESC's BEC servo wire connects to Flysky receiver (Channel 1). My transmitter is Flysky FS-TH9X. A standard 3 cell Lipo battery. When I try to configure the ESC, I hear a music, then a

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