bluetooth module is CSR via USB.
root@GL-MT300A:~# lsusb
Bus 001 Device 004: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
Bus 001 Device 003: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 058f:6254 Alcor Micro Corp. USB Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@GL-MT300A:~#
root@GL-MT300A:~# bluetoothctl
[NEW] Controller 00:09:DD:40:AD:3C BlueZ 5.33 [default]
[NEW] Device 5E:55:46:65:72:AE PRO3523
[bluetooth]#