YAMAY Wireless Bluetooth Headset with microphone?? HD stereo music?? over the head design?? Noise canceling?? duel sharing?? supports online conversations in Skype?? QQ?? MSN?? battery life allows 12 hours of continuous talk or 250 hours of standby.</br>? Multipoint function: The headset can work with 2 cellphones at the same time?? but no two computers or one cellphone and one computer. And talk?? play music?? game just one headset to solve. Cause it is impossible that the headset is playing two cellphones's music at the same time. When the headset has connected with 2 cellphones?? if it is used to make calls with any one of them?? the headset will disconnect with the other one automatically temporarily?? and reconnect after calls end.</br>? Mute Function: Please press and hold the "ous"button for seconds?? until you hear "u du du" then the mute function is on. Now on one can hear you! The same way to turn off the mute function.</br> Compatible: This headset only can work with the bluetooth 4.0 enabled cell phones or computers like Samsung iPhone LG Huawei Dell Apple HP so please make sure your device has bluetooth function before buying.</br> Three Month Warranty: At YAMAY we're continuously developing innovative products and keep customer satisfaction as our number one priority. To ensure that you receive a product you're happy with each purchase is back with our three-month warranty</br></br>Product Description</br></br><b>Specification</b><br> Bluetooth : Bluetooth V4.1<br> Supported profile: HFP v1.6 HSP v1.2 A2DP v1.2 AVRCP v1.0 <br> Working Time: About 12 hour <br> Standby time: About 250 hour(Connected mode)<br> Charge time: About 2 Hour<br> Battery Capacitance: 350mAH <br><br> <b>Package includes:</b><br> 1 x Bluetooth Headset<br> 1 x with Charging Cable doesn't include adapter<br> 1 x User Manual <br><br> <b>Important Note: <br><br> NO.1?? Do not use the headset when charging?? if not?? the battery will be damaged; <br> NO.2?? This Microphone is only 330 degree rotation. So?? do not rotate the Microphone to 360 degree?? if no?? the Microphone will not work any more.<br><br> <b>If your headset cannot work with your smartphones or computers.<br><br> N0.1: This headset only can w" the bluetooth 4.0 enabled smartphones or computers?? like?? Samsung?? iPhone?? LG?? Huawei?? Dell?? Apple?? HP. But?? pls make sure your device has bluetooth function first.<br><br> NO.2: Bluetooth Driver problem: If t