Bluetooth V2.0 with CSR chipset Mono headset
Talk time:Up to 5 hours
Standby time:Up to 150 hours
Weight:about 8 grams
Dimensions(LxWxH):44x19x10.5mm
Battery type: Poly-Li battery
Support profile:Headset and Hands-free
Transfer a call between the mobile phone and the headset
Reversible hook for either ear with smooth material for long hold                        Multifunction:make a call,end a call,reject a call,call redial muting,volume adjustment,three-way call*,call waiting,*voice recognition*

*Some function need the support of the phone feature or network service

Bluetooth V2.0 CSR chipset Mono headset
Talk time:Up to 9 hours
Standby time:Up to 250 hours
Weight:about 13 grams
Dimensions(LxWxH):60x24x10mm
Battery type:Poly-Li battery
Support profile:Headset and Hands-free
Transfer a call between the mobile phone and the headset
Reversible hook for either ear with smooth material for long hold                        Multifunction:make a call,end a call,reject a call,call redial muting,volume adjustment,call waiting,*voice recognition* 

*Some function need the support of the phone feature or network service

Bluetooth V2.0 with CSR chipset Mono headset
Talk time:Up to 13 hours
Standby time:Up to 300 hours
Weight:about 16 grams
Dimensions(LxW):67x26mm
Battery type: Poly-Li battery
Support profile:Headset and Hands-free
Transfer a call between the mobile phone and the headset
Reversible hook for either ear with smooth material for long hold                        Multifunction:make a call,end a call,reject a call,call redial muting,volume adjustment,call waiting,*voice recognition*

*Some function need the support of the phone feature or network service

Class II with ISSC Chipset Bluetooth Stereo Headset V2.0, 10m

* Dimensions: 46 x 21.6 x 21 mm
* Sound
Frequency Response: 20 Hz - 20 KHz
Sample Rate: 48 KHz, 16 Bit
SPL (Sound Pressure Level): 105 dB @ 1 KHz
THD (Total Harmonic Distortion): 0.5 %
SNR (Signal to Noise Ratio): 85 dB
* Bluetooth
Specification: Bluetooth v2.0 compliant
Bluetooth Profile Supported:
A2DP (Advanced Audio Distribution Profile)
AVRCP (Audio Video Remote Control Profile)

Class II with ISSC Chipset  Stereo Headset V2.0, 10m

 * Dimensions: 38 x 38 x 19 mm
* Sound
Frequency Response: 20 Hz - 20 KHz
Sample Rate: 48 KHz, 16 Bit
SPL (Sound Pressure Level): 105 dB @ 1 KHz
THD (Total Harmonic Distortion): 0.5 %
SNR (Signal to Noise Ratio): 85 dB
* Bluetooth
Bluetooth V1.2 compliant
Bluetooth Profile Supported:
A2DP (Advanced Audio Distribution Profile)
AVRCP (Audio Video Remote Control Profile)
HSP (Headset Profile)
HFP (Hands-free Profile)

* Class II with CSR Chipset Mono Headset

* Handsfree 1.5 and Headset 1.1 profiles
* Headset and handsfree profile supported. 
* Up to 4 hrs talk time and 200 hrs standby time. 
* Removable ear-hook fits either ear. 
* Compatible with various Bluetooth enabled devices such as mobile phones, PDAs and Laptops. 
* Noise suppression, echo elimination and duplex sound for crystal clear quality calls.