JTD NFC-Enabled Bluetooth 4.0 Audio Receivers / Music Streaming Adapter for Car & Home Stereo Sound System Bluetooth 4.0 Supports Bluetooth A2DP and AVRCP, Built-in signal strengthening,the working range reaches 10m(33ft),even if blocked by a wall, it also has strong signal, so that you can enjoy wireless music at most of corner in your house. Turn your existing speaker/dock into wireless speakers, and it can work with iOS devices(iPhone, iPad, iPod touch, Mac Book), Android and Windows Bluetooth-enable devices (Smartphone, tablet,Laptop, PC), and other Bluetooth devices. you can use it in your car if it has 3.5mm Aux port available. It takes about 2 hours to finish charging. 3.5mm Aux cable hidden, Compact and neat, easy for carrying and storage, especially when you are on travel. With NFC (Near Field Communication) technology, you can easily & conveniently connect it with your device which is with NFC enable. The play time and standby time reaches 12hours and 180hours separately, and it will power off automatically if no device can be connected in 5minutes, not like others, you are unnecessary to recharge it frequently.