Upgraded Bluetooth 5.3This Bluetooth 5.3 aux adapter can turn your old Non-Bluetooth devices into Bluetooth enabled device,offer faster transmitter speed,higher reliability,stability and lower power consumption. Note: It's a Bluetooth receiver,not transmitter.Hands-free Calling & Voice ActivationBuilt-in microphone, allowing you to enjoy hands-free calling directly through this car Bluetooth adapter, this aux Bluetooth adapter can activate voice assistant by holding multi function button for 3 seconds, making your drive more safe and convenient.Dual Connection & Auto ConnectionBluetooth aux adapter can connect with 2 devices at the same time, You won't miss any calls while listening to music. The Bluetooth aux receiver will auto connect to your last paired Bluetooth devices when turn on again.Fast Charging & Long LastingThe Bluetooth adapter lasts up to 16 hours when making calls or playing music, and it can be fully charged in just 1.5 hours using the USB Type-C fast charging cable(Included).Instant Setup, Plug and Play This Bluetooth car adapter designed with ON/OFF slider switch and it will automatically enter into paring mode when you switch on. Note: It will power off if not paired within 10 minites and into standby,please press the multi-function button or turn off and re-on to connect again.