Features: brand new and high quality brand new and high quality Easy To Operate: Simply connect your speaker with our device, immediately transform your speakers into a fashionable wireless BT speaker. Wireless Play: Removing troubles of wired connection, through the wireless connection and transmission ,enjoy a for high fidelity music at any place indoor by wireless control. Portable design: with mini size ,the feature of portable can let you carry them to anywhere you want. Lossless High-quality Sound Quality Presentation: The latest RDA solution technology, the device and speakers are connected via BT, without loss of sound quality. Let you enjoy the most original high-quality music. Hands-free Answering of High-definition Calls: Built-in microphone, the phone is connected to Bt and transmitted to the car audio, hands-free amplification, high-definition calls, hands are kept from the steering wheel, driving is safer. Specifications: Name: NFC Bt Receiver Interface: Stereo analog / AUX3.5mm Model: H2 Output impedance: 75 ohms Frequency response range: 10Hz-20kHz Signal to noise ratio: >1 10dB Effective distance: 10 meters Distortion + noise: