Sunwee&reg; Bluetooth Audio Receiver with NFC for Home Stereo Wireless Speaker Adapter Bluetooth 4.0 SD Card Support It can turn the traditional wire speaker and your home stereo to wireless, transmits up to 33 feet away. Bluetooth 4.0 with EDR for a better wireless performance and NFC functional is optional Can be used for car&Home Stereo and answer a phone call Super conveniently portable, easy for carry and great for travel. Easy Quick Use: Charge it with USB cable; hook it up to your stereo, car audio jack, etc via the included 3.5mm audio cable ; pair your device through bluetooth; Then you can enjoy the smooth music