Bluetooth Wireless Stereo Earbud Headset Version 4.0 New State of the Art Also known as stereo bluetooth headset profile, AZDP allows for a dual channel audio stream through a stereo headset. AZDP is an especially popular concept with MP3 and music phones because it lets users listen to music wirelessly. It can also be used to make calls and users can switch between music and calls at the touch of a button. Bluetooth devices are highly portable devices, but they are also complex products wiith plenty of features: capable of noise cancellation, voice commands for head's free use, PC integration or even stereo audio. Some headsets are designed to be big and bulky, while others are designed to be small enough to go practically unnoticed. They are crafted for discreet calls when out and about. As a result battery life and other features especially take a backseat to stealth. The phone is connected by magnet.f This Bluetooth headset is comfortable, flexible and light neckband. Ear set is easy to handle with magnetic properties. It uses the world's famous brands CSR4.0 blluetooth chips. It has an extended battery life. Talk time is up to 15 hours; playtime up to 10 hours. There is a mullti-point connection/battery status alert; charging time is less than 2 hours. Battery 3.7V/195 m AhLi polymere. Other features: POC antenna 5 band fully configurable EQ Surface mount package for embedded application 3LED outputs Security simple pairing voice (optional) parameters configurable, 1mvic audio enhancement SBC, MP3. There are many questions one may asked: Is there noise reduction? Is there echo cancellation? Is there multi-point connection? Is last number redialed? Is there status battery alert? Is there connection vibrate alert? Is this apt x technology? Answers to all these questions are: POSITIVELY YES.