Features:
BTD-401 transforms any computer with a USB port to a Bluetooth enabled computer Built with the latest Bluetooth specification v4.0 Class 2.
Supports all common Bluetooth (wireless) peripherals like keyboards, mice, headsets, stereo headphones, etc.
Supports A2DP, PAN, ATT, AVRCP, PAN, GAVDP, HCRP, HFP, HID, HID over GATT, GATT, OPP, and more.
Quick Intelligent sleep wake up function, strong transfer signals, 3Mbps transfer rate.
Backwards compatible with Bluetooth versions 2.1/2.0/3.0.
Compatible with Windows 8/ Windows 7/ Vista/ XP. 
Consumes very low power.

Specification:
Conditions: 100% Brand New And High quality
Model: BTD-401
Color: Black
Chipset: CSR8510
Bluetooth version: Bluetooth V4.0+EDR V1.1/2.0/3.0
Interface: USB 2.0
Frequency range: 2.4GHz (2402-2480MHz)
Transfer rate: 3Mbps
Distance: 0-20M(range within 10M is recommended)
Voltage: DC 5V
Current: 500mA
Power consumption: 5W
OS supported: Windows 10/ Windows 8/Windows 7/ Vista/ XP
Item size: 25 * 15 * 7MM/ 1.0 * 0.6 * 0.3in(L * Head width * T)

Package Included:
1 * Bluetooth adapter
1 * CD Driver

Pleses Note:
1. Windows 8 automatically finds and installs the latest drivers when the BTD-401 dongle is plugged in for the first time. Windows 7 / Vista / XP users need to use the included CD (or online links) to install the drivers.
2. If you need to transmit audio file, "BlueSoleil" software needs to be downloaded.