Features:
1) Bluetooth handfree headset profile
2) Compliant with Bluetooth 1.2
3) Class 2 TX power
4) Frequency: 2.4GHz
5) Channels: 79
6) Longest standby time: 300 hours
7) Longest talk time: 9 hours
8) Weight: 21.5g
9) Rechargeable battery Li-polymer
10) Working range:
    a) Indoor: 5m
    b) Outdoor: 10m
11) Dimensions: 63.7 x 28.6 x 10.5mm

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