FiiO BTA10 Bluetooth 5.0 Adapter for Audio-*Technica ATH-M50x/MSR7 Amplifier with cVc noise cancellation technology ptXLL/AAC - AliExpress Consumer Electronics
FiiO on Twitter: "@zhenkit Sorry to hear that! Can the BTA10 work normally when the Blue light is on? Is the device connected to USB for charging? Can you ask him to
BTA10-400B TRIAC TO-220 ''UK COMPANY SINCE1983 NIKKO'' | eBay