Review on 🔌 TUNAI Firefly Bluetooth Receiver: Ultra-Small USB Wireless Audio Adapter with 3.5mm AUX for Car/Home Stereo Music Streaming; Auto-On, No Charging Required - Car Kit (Gold) by Yuri Rochelin

EDIT: I upgraded from 1 star to 5 stars after replacing the unit. The original had a ground loop problem so I followed the FAQ and contacted the seller. They sent me a replacement unit that works great! I'm so glad I contacted them and was impressed with their customer service. Original Review: Setup is easy and the auto connect works with the last phone it was connected to but. This thing has a bad ground loop, but only when no audio is being played through. So as long as you don't press play on your phone, you will hear the buzzing of the throttle, ignition, turn signals, etc. Once you press play, everything is fine. The sound is more than adequate for a car. It's just a howl you hear while you're in! It's so tiring. I've tried different USB power adapters and the problems persist.