Specification: Name: NFC Bluetooth-compatible Audio Receiver Colour: Black Material: ABS Bluetooth-compatible version: V5.0+EDR Bluetooth-compatible protocol: A2DP/AVRCP Bluetooth-compatible distance: <15 meters Interface: RCA / AUX / USB Frequency range: 10Hz-20kHz Signal-to-noise ratio: > 110dB Impedance: 75 Support multiple audio output ports: connect 3.5mm headphones, stereo system, speakers Support USB 5V DC output, can also charge for iPad, for iPhone System Support: All Bluetooth-compatible audio devices; NFC devices available Features: 1. The latest Bluetooth-compatible 5.0 version: in line with the 5.0 version specification, backward compatible with Bluetooth-compatible 4.2/4.1/4.0/3.0/2.0/1.0. 2. Support NFC: built-in chip, touch this receiver to directly connect to NFC mobile phone or other NFC-enabled Bluetooth-compatible devices 3. Play music on 2 speakers at the same time: With USB, 3.5mm and 2RCA connection options, you can wirelessly enjoy music on 2 speakers at the same time. 4. Support dual audio port connection: Equipped with 3.5mm and 2RCA audio ports for more devices (including 3.5mm cable and 2RCA cable). 5. Remote wireless connection: The wireless bluetooth-compatible adapter supports up to 15m/49ft connection to control music played from a distance. 6. Support auto on/off: connect your car/other power source with the charger cable, when you start the car or have power, it will automatically turn on and automatically connect to your last connected device. When the car is turned off, it will automatically turn off. includes: 1 * Receiver 1 * 3.5mm RCA Cable 1 * 3.5mm Male to Male Cable 1 * USB Power Cable 1 * User Manual