Latest Bluetooth 5.0 Technology] 1Mii Bluetooth car adapter equipped with the latest Bluetooth 5.0 to ensure instant pairing and maintain a strong and stable connection. With Bluetooth 5.0 technology, 1Mii Car Bluetooth Adapter is backward compatible with Bluetooth 4.2/4.0/3.0/2.0 devices. [Volume Control] 1Mii Car Bluetooth Receiver designed with volume button up/down, it is very convenient to adjust the volume of your Bluetooth audio system. [Built-in Microphone] 1Mii Car Bluetooth Aux Adapter has a built-in microphone, one-click multi-function button to answer / hang up / decline or call back. The car Bluetooth receiver can respond to voice commands via the built-in microphone. Instead of using your phone, you can activate the voice assistant by pressing and holding the PLAY/PAUSE button on the adapter for 2 seconds. [EASY TO USE] Plug and Play. Long press PLAY/PAUSE button for 2 seconds to enter pairing mode (for first time use, ML100 Bluetooth receiver will enter pairing mode automatically), then turn on Bluetooth on your devices and click ML100 to pair. [Excellent Battery Life] The 1Mii AUX Bluetooth adapter has a long battery life and can support 15 hours of continuous use for calling or listening to music. In addition, the small and portable size of the Bluetooth auxiliary adapter is very convenient to use in the car or to carry with you.