Features:1. Music Receiver (Hands Free): A high-tech wireless device that accepts Bluetooth-enabled mobile phones or other audio devices.2. Use all audio inputs: for example car audio or home audio with a 3.5mm audio interface.3. With wireless Bluetooth technology: Enjoy high quality music in the office or in the car.4. Make and receive calls.5. Hands-free function.Descriptions:1. Embedded echo cancellation microphone.2. Switch between music and phone with one button.3. About 4 hours of music/play time, 1 hour for full chargeSpecifications:Bluetooth: V4.2Connector(s): 3.5mm JackType: AdapterColour: Blacksize:58*13*13mmPackage Included:1 set * 3.5mm audio Bluetooth transmitter receiverNotes:1. Due to differences between different displays, the picture may not reflect the actual color of the item.2. Physical errors may exist due to different personal measurement techniques. Thank you