The BT Receiver is specially designed for headphones, car stereo systems and home audio system, changing the devices without BT into BT-enabled ones, and easy to pair with BT-enabled smart phones, laptop, tablet, etc. With this product, you can greatly enjoy music from your phone, laptop, MP3 and more without the hassle of cables.Features:[BT Audio Receiver]:It changes the traditional headphones and speakers into BT-enabled ones. After paired, play music wirelessly from your BT-enabled audio devices without the hassle of cables.[Advanced BT Technology]:Wireless 4.1+EDR technology ensures transmitting strong signal in high quality and high speed. BT range reaches up to 10 meters in open space without obstacles.[Hands-free call & Multi-pairing]:With built-in microphone, it enables hands-free calls to ensure driving safety. Multi-point connection function ensures to switch between your business and personal phones.[Strong Compatibility]:Compatible with Android and iOS smart phones, tablet PC and more BT-enabled audio devices. 3.5mm audio port design, suitable for headphone, speaker and other stereo system.[Low Consumption]:Built-in 60mAh Battery ensures up to 4 hours working time. Compact and portable with back clip, convenient to use. Supports self timer function.Specifications:BT Version: BT4.1+EDROperating Distance: 10m (no obstacle)Sensitivity: ±42dBOutput Connection: 3.5mm AUX Output PortOutput : 30mWBuilt-in Battery: 60mAh Lithium Battery 401020Working Time: about 4 hoursStandby Time: 250 hoursCharge Time: about 50 minutesCharge Port: Micro USB 5VMaterial: PlasticColor: Black/White (Optional)Item Size: Approx. 57*12*12mm/2.24*0.47*0.47inItem Weight: 7g/0.27ozPackage Size: Approx. 13.0*10.0*1.5cm/5.11*3.93*0.59inPackage Weight: 23g/0.79ozPackage List:1 * BT Receiver1 * USB Cable1 * 3.5mm Audio Adapter1 * English-Chinese User Manual