Wireless Streaming System: The C52 Bluetooth receiver upgrades home speakers and car radios to "Bluetooth speakers" without Bluetooth functionality, allowing you to enjoy music wirelessly from your smartphone. Bluetooth 5.1 Technology: The C52 Bluetooth receiver contains the latest Bluetooth Ver5.1 low energy loss chip, which is not only compatible with older versions of the product but also offers a longer transmission distance and higher speed than Bluetooth 4.0. NFC Function: When using your mobile phone after activating the NFC function on it within the NFC detection range of this product, you can connect with one click (the mobile phone must have the NFC function). It is convenient and fast. Product Specifications: Size (6.8 x 6.8 x 2 cm), Weight (45 g), Audio Connector (NFC, TF Card Slot, 3.5mm AUX, RCA AUX), Receiving Range (within 10 m), Input Voltage 4.8V to 5.25V. Easy to Install, Easy to Use: Connect the power, you can connect directly to pairing mode, turn on your smartphone's Bluetooth, and select CB2.