The Fosi Audio VOL20 is a CNC-machined zinc-alloy desktop knob that controls volume, play/pause, track skip and mute over Bluetooth (10m or more) or USB-C, with a four-mode RGB light ring and a 750mAh battery. It suits PC, Mac, phone and tablet users who want a physical volume dial on the desk.
Who the Fosi Audio VOL20 is for
Desk and PC setups: It works as a plug-and-play USB or Bluetooth peripheral for PCs, Macs and laptops, with no drivers needed.
Control from across the room: Bluetooth reaches 10m or more, so the knob does not have to sit next to the computer or tablet.
Media playback: The button handles play/pause, next and previous track and mute, while the endless dial sets volume.
RGB desk lighting: Pick constant color, spectrum cycling, auto-off after 5 seconds or lights off; Fosi rates about 15 hours with lights on and up to 500 hours with them off.
Skip it if: you want a knob that controls a DAC or amp directly; Fosi notes most DACs and amps do not accept it, since it works as a peripheral of the source device.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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