I have this one on the boat. Does what you want and works pretty well for less than $20.
4. Nulaxy Bluetooth Car FM Transmitter Audio Adapter Receiver Wireless Hands Free Car Kit W 1.44 Inch Display - KM18

The
Nulaxy KM18 is a quality, technologically-superior, adjustable, wireless, Bluetooth car adapter. It is compatible with most market devices including Apple, Xiaomi, Sony, Samsung, and Oppo. It has a 5V port for quick-charging your devices. You can charge your phone while you listen to your music
The KM18 has an advanced noise reduction system for perfectly-clear sound, as well as play-mode features and a voltmeter for your enjoyment and driving safety. Play your music through your TF card, Bluetooth, or AUX cable.
This Bluetooth FM transmitter type adapter plugs into your car’s cigarette lighter and connects your phone via Bluetooth with your radio signal and frequency. It has a large 1.44-inch screen that displays incoming phone calls, music selections, and your car’s battery voltage.
The downside is, if your car does not automatically shut off the cigarette lighter when the car is shut off, this Bluetooth car adapter can drain your battery if it is left plugged-in. Also, as is typical of FM transmitter adapters, it may be more difficult to get a strong FM signal/frequency in and around city areas.
Recommendations:
The Nulaxy KM18 Bluetooth car adapter is intended for those that do not have 3.5mm AUX-in plug in their vehicle but still want maximum device compatibility and features. It comes in six colors to match your car’s interior. A 6-month limited manufacturer’s warranty is also included with this product.
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