Just to try and clear up this volume knob issue... the orange knob comes with the blue version, the grey knob comes with the grey version. Unsure why Fosi sent Amir a blue version with a separate orange knob
@Fosi Audio?
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This is as per Aliexpress and Fosi Audio Shop;
Experience Hi-Fi audio with the Fosi Audio BT20A Pro home amplifier. Enjoy 300W x 2 power output, upgraded Bluetooth 5.0 connectivity, and sound controls.
fosiaudioshop.com
However if a customer has purchased from a vendor that gives no colour options and shows the blue/orange version... that is what a customer should get and is grounds for a return for sure. Or are people receiving the blue version with a blue knob and no orange knob as separate?
This site for example doesn't give an option for colour or power supply choice;
The Fosi Audio BT10A PRO is a small, compact and powerful Class D amplifier, offered at a resonnable price. Its amplification stage uses a TI TPA3255 chip, capable of developing a power of 2x300W under 4Ω with a high efficiency.
www.audiophonics.fr
* Note, these can be purchased without a power supply too at some sites.
JSmith