This transmitter was very frustrating.
The 12v socket plug coming very loose as soon as you drive over a bump, which results in the transmitter restarting, and you then have to reconnect your Bluetooth over and over again.
The sound quality on FM was also very poor when compared to another transmitter I’ve purchased.
I have dropped the seller a message, to see if they’d offer a return and refund but I’ve not heard back sadly.
I would avoid this one at all costs.