Specification:
 
  1. Model : BTD-401
  2. Chipset : CSR8510
  3. Interface : USB 2.0
  4. Voltage : DC 5V
  5. Current : 500mA
  6. Transfer rate : 3Mbps
  7. Power consumption : 5W
  8. Item weight : 9g / 0.3oz
  9. Item size : 25 * 15 * 7mm / 1.0 * 0.6 * 0.3 inch 
10. bluetooth version : bluetooth V4.0+EDR V1.1 /2.0 /3.0
11. Frequency range : 2.4GHz ( 2402-2480MHz )
12. Distance : 0-20M( range within 10M is recommended )
13. OS supported : Windows 10 / Windows 8 / Windows 7 / Vista / XP

Features:

1. Supports A2DP , PAN , ATT , AVRCP , GAVDP , HCRP , HFP , H ID,  H ID over GATT , GATT , OPP , and more.
2. Backwards compatible with bluetooth versions 2.1 / 2.0 / 3.0.
3. Supports bluetooth ( wireless ) peripherals like keyboards , mice , headsets , stereo headphones , etc.
4. Intelligent sleep wake up function , strong transfer signals , 3Mbps transfer rate.
 
Package included:

1X Mini Wireless Dongle CSR 4.0 bluetooth Adapter  V4.0 USB 2.0/3.0 For Win 7/8/10/XP For Vista 32/64 

Note:

If you need to transmit audio file, "BlueSoleil" software needs to be downloaded.