Question about M-Audio BX4BT

The M-Audio BX4BT connects in the A2DP profile with SBC codec at a maximum of 345 kBit/s and a sampling rate of up to 48 kHz, i.e. normal low complexity subband codec. The Bluetooth module of the BX4BT does not support AptX, AAC, LDAC or other codecs. However, I cannot find any information as to whether the BT module is equipped with 4.x or 5.x.

It must be at the end of the device designation BT.