1). Blocks 4 times the external noise

2). Crystal clear sound with DSP

3). Support A2DP,AVRCP,headset,handfree profile

5). Redial the last call ,Reject call.Volume adjustable.

6). Faster connecting,clear sound,anti-interference.

7). Listen to MP3 music from cellphone.

8). Listen to stereo music from PC.

9). On-line chat through BT wireless transmitter

10). Faster connecting, clear sound, anti-interference

11). Over-the-head Design

Specification:

1) Bluetooth protocol: version 2.1

2) Frequency: 2.4 GHz

3) Bluetooth range: 10meters.

4) Net weight: 10g

5) Power supply:DC5.1V/120Ma

6) Working volt: 3.7V

7) Battery:  rechargeable Li-Ion  battery

8) Talking time:up to  12 hours

9) Standby time: up to 250 hours

10) Chargeing time: about 3 hours.

Accessory:

1).Charger(optional).

2).USB Charging line 

3).User guide .