Bluetooth Module 2 (Hardkernel) Supports v2.0  v3.0 & low energy v4.0 (BLE)

The mini USB Bluetooth dongle.
CSR8510 A10 Chipset inside

Supports :

• Classic Bluetooth v2.0
• Bluetooth High Speed v3.0
• Bluetooth low energy v4.0 (BLE)
• Bluetooth MAC address is not programmed,
  If you need a unique MAC address, follow this instruction
  http://blog.petrilopia.net/hacking/change-your-bluetooth-device-mac-address/