eppfun AK3040R Bluetooth 5.1 Receiver, with NFC, TF Card Slot, 3.5mm AUX/RCA, Wireless Audio Adapter Low Latency for Home Music Streaming Stereo System 
【Wireless Audio Streaming System】 The C52 Bluetooth receiver upgrades home speakers and car stereos that do not have Bluetooth function to "Bluetooth speakers", allowing you to enjoy music in your smartphone wirelessly. 
【Bluetooth 5.1 technology】The C52 Bluetooth receiver incorporates the latest low energy loss Bluetooth Ver5.1 chip, which is not only compatible with older versions of the product, but also has a longer transmission distance and more than Bluetooth 4.0. Has a fast speed 
【NFC Function】 If you place the mobile phone in the NFC sensing area of ​​this product after turning on the NFC function of the mobile phone, it is convenient and fast because you can connect with one touch (the mobile phone must support the NFC function). 
【Product Specifications】 Size (6.8 * 6.8 * 2cm), weight (45g), audio port (NFC, TF card slot, 3.5mm AUX, RCA AUX), reception distance (indoor 10m), input voltage 4.8V to 5.25V 
【Easy Setup Easy to Use】 Connection power supply You can connect by directly entering the pairing mode, turning on the Bluetooth of the smartphone, and selecting CB2. 
【Warranty】This shop focuses on your good shopping experience, we offer a 12 month warranty and if you have any questions please feel free to contact us .