Equipped with a USB card slot Bluetooth stereo receiver allows you to play music from your smart device or USB (memory card)! Whether you use an old speaker, an old stereo system or a car stereo system, you can easily convert music to wireless via RCA or 3.5 mm cables on the Bluetooth audio receiver. 2-in-1 Bluetooth transmitter/receiver In transmitter mode, the Bluetooth adapter pairs with Bluetooth headphones or speakers. In receiver mode, it connects to traditional wired speaker stereo receivers, Aux input ports on car adapters, making them wireless and allowing mobile phones or tablets to listen to your favorite music. Broad compatibility Supports NFC function, connect Bluetooth when your mobile phone is nearby (mobile phone must have this feature). As a Bluetooth audio transmitter, it converts non-Bluetooth TV boxes, computers, laptops, tablets etc. to Bluetooth functionality. Enjoy life with wireless technology. Multiple interface options Built-in digital-to-analog chip, supports 3.5 mm AUX, RCA, USB (memory card), TF interfaces. Supplied with AUX cable, RCA cable, USB charging cable, fulfilling all your connection needs and adapting to different audio devices with Bluetooth or non-Bluetooth functionality. In this way, you can enjoy high-quality music wirelessly or listen to late concerts without disturbing your loved ones while they sleep. Broad coverage range Bluetooth stereo receiver can cover up to 15-21 meters with a reliable connection. No more cable limitations and provides you with definite much more convenience with a