The UGREEN Bluetooth 5.0 Receiver allows you to add wireless connectivity to older audio systems, such as car stereos or wired headphones, via a 3.5mm AUX jack. It utilizes the aptX codec to maintain high-quality sound at 16-bit / 44.1 kHz, ensuring your music remains clear and detailed. This compact black device measures 57 x 28 mm and features a built-in microphone with CVC 8.0 noise cancellation for hands-free calling. You can connect two Bluetooth devices simultaneously, which is helpful when switching between different phones or tablets within a 10-meter range. A full charge takes about 2 hours via USB, providing up to 10 hours of active playback or up to 300 hours of standby time.