Features:

1) Operating frequency band: 2.4GHz - 2.48GHz unlicensed ISM band

2) Bluetooth specification: V1.2

3) Support profiles: headset and hand-free profiles

4) Output power class: Class 2

5) Battery voltage: 3.7V DC

6) Charger: 5.0VDC 5.8V (type 300mAh)

7) Talk time: 5hrs

8) Standby time: 120hrs

9) Battery charging time: 2hrs

10) Range of operation: max. 10m line of sight

Features:

1) Easily enable IRDA function on the PC through USB port

2) Transmit distance up to 1.0m

3) Transmit angle up to 30

4) USB plug and play convenience

5) Fully compatible with IRDA 1.3 and USB 1.1

6) IrDA date rate from 2.4Kbps to 4Mbps 

7) No power adapter required 

8) Pentium, Pentium II, Pentium III or compatible IBM PC

9) Supports WIN98 / 2000 / XP or higher

Features:

1) Bluetooth specification: V 2.0

2) Communication range up to 10m

3) Supports Windows 98SE, ME, 2000, and XPOS

4) Wireless transmission, no more wired persecution

5) Point to multipoint transmission, easy to link other Bluetooth devices 

6) Friendly version, easier to use