Specification:

Using the broadcom 2042 main chip, with bluetooth2.0 Interface
Using the Bluetooth industry leading software solutions, WIDCOMM BTW (Microsoft officially designated software) Bluetooth software
Support for Windows 98/ME/2000/XP/2003/VISTA operating system,Windows Mobile6.0 or Symbian S60 smartphone operating system compatible.
Receiver sensitivity:-75bm (standard) up to 4bm, low radiation
Modulation: 2.4G Direct Sequence Frequency Hopping (FHSS)
Transmit power: Class 2 level
Built-in lithium battery, full use of more than 3 months, giving charge line.
The appearance of total size: 284.5mm * 119.8mm * 6.70mm see photos
Windows xp, Vista, windows 7 free drive systems