Why is there a blue light on the rear of the Alva TT?

The blue LED on the rear of the TT is to indicate the Bluetooth availability and connection status of the turntable.

Please find a brief synopsis of the different indications.

Fast flashing – In pairing mode.
Slow flashing – Searching for the last paired device.
Solid – Paired with a device.
Long solid intervals – Paired with a device using aptX/aptX HD codec.

If you do not wish to see the LED, you can adjust the switch to the left of this to the Off position.