USB Bluetooth Receiver FM Transmitter Audio Speaker Wireless Music Adapter Car DESCRIPTIONS Automatically connect with your phone or other previously paired device straight away. Ultra-stable Bluetooth 5.0 technology for fast connectivity and HD quality audio streaming. Compatible with all Bluetooth enabled phones, tablets, laptops etc. Connect directly with your car's FM radio, simply turn your car's FM station to the LED displayed frequency and enjoy music! BR7 supports Multi-Point techonolgy, The smart receiver can be linked to two devices at the same time and works simultaneously. Compatible with Android, Windows and Apple iOs. Answer calls on the go. Built-in microphone for hands-free phone calls, keep safe driving. (* the phone call quality depends on where the USB plugged in, longer distance/enclosed environment will reduce the audio level) Bluetooth-enabled Devices: Smartphones / Tablets / Laptops / Sat-Navs / MP3 Players etc Audio Equipment: FM Radio/ Car Aux / Home Stereo Speakers Specifications Bluetooth Specification:  V5.0 + EDR Microphone: Built-in Frequency range: FM 87.5-108.0MHZ Additional Output: 3.5mm AUX Power Connector: USB Card Reader: Micro SD Signal Noise Ratio: >= 90DB Fequency Response: 20Hz - 20K Hz Wireless Range: up to 10M Cable Length: 30M - 1.5M In the Box: Bluetooth FM Adapter User guide