Latest Bluetooth 5.3: Enjoy clearer calls in the car and higher-quality music with UGREEN Aux to Bluetooth 5.3 Receiver. The latest Bluetooth 5.3 can greatly improve the speed and stability of Bluetooth transmission, and increase the sound signal-to-noise ratio to over 90dB. Hands-Free Calling for Car: Ensure safe driving with UGREEN Bluetooth 5.3 Car Adapter. The Bluetooth receiver is designed with a big one-touch answer button and a built-in microphone, which allows you to easily answer calls through the car's speakers while driving. 15H Battery Life & Fast Charging: With the large capacity built-in battery, UGREEN Aux Bluetooth Adapter can play music continuously for 15 hours or stand by for 200 hours. It can be fully charged in just 2 hours with the USB-C charging port. Plug and Play: UGREEN Aux to Bluetooth 5.3 Receiver can easily use with car audio systems, speakers, amplifiers, and headphones. Just plug the adapter into the 3.5mm aux port, and you can easily connect these devices to mobile phones, tablets, etc. Dual Device Connection Supported: UGREEN Bluetooth 5.3 Receiver support connects 2 devices simultaneously. You can easily switch devices for calls and music while driving, and change music with your friends at parties. The Latest Bluetooth 5.3 Receiver for Cars, Speakers, Home Stereo