Upgraded Version: Bluetooth audio adapter receiver built-in new generation Bluetooth 5.0 chip, low latency, strong signal. The audio signal transmission will not be distorted, the connection is more stable, and the sound quality can reach the Hi-Fi standard, providing you with high-quality sound and immersive sound experience Automatic Opening and Automatic Connection: USB power supply, no battery required. When starting the car. This Bluetooth car kit will automatically turn on the power, and then automatically synchronize with the last connected mobile phone (please make sure that the mobile phone's Bluetooth is turned on before starting the car) Multi-Purpose: Our device has two purposes. It is not only a Bluetooth adapter receiver, but also a Bluetooth transmitter. The mini is easy to carry, so you can use it in different situations. Provide hands-free Bluetooth solutions for your various non-Bluetooth devices at any time Perfect Compatibility: Our 3.5mm Bluetooth adapter is perfectly compatible with most smart phones and bluetooth electronic devices (such as iPhone, ipad, samsung, lg, etc.), and is very suitable for home or car audio systems, TV, PC, projectors, Speakers etc Easy to Use: Multi-function button, you can switch modes easily. Just click a button to play/pause/answer/cancel/or end a call. Built-in high-performance microphone with noise reduction (CVC) technology, the call effect is clear. Provide you with hands-free calling/GPS/music etc Our Bluetooth 5.0 aux audio adapter receiver. Designed for non-Bluetooth audio systems. For your various non-Bluetooth home audio systems or car speakers, this is the ideal solution to achieve ideal wireless audio. A device has two purposes, the dual mode is not only a receiver or a transmitter, making your life more intelligent. Very Easy to Use: Transmitter mode: 1.Insert the transmitter receiver into the USB port (if your device does not have a USB port. You can use a mobile phone charger or power bank, etc.). 2.Then use 3.5mm audio cable/RCA audio cable to connect the product to TV, PC or other devices. 3.Turn on your Bluetooth device. The transmitter will automatically search for your Bluetooth receiving device (such as Bluetooth headset, Bluetooth speaker, Bluetooth receiver, etc.). Receiver mode: 1.Plug the device into the USB port to supply power (such as car charging, wall charging, power bank, etc.), 2.The device light flashes blue quickly, connect the device with your non-Bluetooth audio device with a 3.5MM audio cable. 3.Turn on the mobile phone Bluetooth, search for Bluetooth devices (wireless music adapter), click and connect. 4.The pairing is successful and start to enjoy wireless music. Note: 1.Before connecting, make sure that your phone is not connected to other devices. 2.In transmitter mode, if the device is not paired with the desired audio device. Tap the function key. It will automatically search for and connect to the next device. 3.The receiver of the Bluetooth aux transmitter only transmits audio, not files. Only one Bluetooth device can be connected in transmitter mode.