Features: 1. HIFI advanced sound quality, lossless transmission. High-end configuration is stable and does not reduce the sound quality of the Bluetooth adapter. 2. Support two mobile phones to connect at the same time, easy to connect, freely control. HD smart chip, higher, faster, stronger. Chip with built-in enhanced signal transmission circuit, AEC echo and ANC noise cancellation circuit, pure sound quality. Products can automatically remember Connection function. 3. Using your phone's Bluetooth connection, the Smart Bluetooth Audio Adapter allows you to display your smartphone audio through a stereo or stand-alone speaker. You can browse and switch music at distances up to 20-30 meters. 4. Fully compatible. As long as the audio device has a 3.5mm audio jack, it can turn into a Bluetooth device. Suitable for amplifier, subwoofer, earphone, lever speaker, etc. 5. Wireless play, eliminate the trouble of wired connection through wireless connection and transmission. Enjoy high fidelity music anywhere in the room through wireless control. 6. Portable design. With mini size, portable function allows you to carry it anywhere you want. Specifications: Bluetooth version: 4.1 Compatibility: mobile phones or tablets and all Bluetooth audio devices for Android/iOS Transmission distance: >20M Working current: 18-28MA Battery capacity: 300mah Working time: 8-10H Charging time: 3H Output connection: 3.5MM stereo interface Size: Approx. 11*6.1*1.2cm/4.33*2.4*0.47inch Package List: 1 * Bluetooth Receiver 1 * 3.5mm Audio Cable 1 * Charging Cable 1 * 2-in-1-out Audio Adapter Cable 1 * User Manual 1、HIFI advanced sound quality, lossless transmission. High-end configuration is stable and does not reduce the sound quality of the Bluetooth adapter. 2、Support two mobile phones to connect at the same time, easy to connect, freely control. HD smart chip, higher, faster, stronger. Chip with built-in enhanced signal transmission circuit, AEC echo and ANC noise cancellation circuit, pure sound quality. Pro 3、Using your phone's Bluetooth connection, the Smart Bluetooth Audio Adapter allows you to display your smartphone audio through a stereo or stand-alone speaker. You can browse and switch music at distances up to 20-30 meters. 4、Fully compatible. As long as the audio device has a 3.5mm audio jack, it can turn into a Bluetooth device. Suitable for amplifier, subwoofer, earphone, lever speaker, etc. 5、Wireless play, eliminate the trouble of wired connection through wireless connection and transmission. Enjoy high fidelity music anywhere in the room through wireless control. 6. Portable design. With mini size, portable function allows you to carry it a