TP-Link NFC-Enabled Bluetooth 4.1 Receiver, Wireless Audio Adapter Streaming Music from Echo Smart Phone Tablet PC to Home Car Stereo Sound System (HA100)

I have a long commute and my car does not naturally have bluetooth. The other day, I was pulling my mpow unit out of the auxiliary port on my car and it broke. Not wanting to be without my bluetooth, I started hunting on Amazon for a new unit.Now, my old mpow unit was good, but it had two issues which I despised:1. Had to be powered on manually by holding the button for a few seconds2. Had a "feedback" noise when charging and playing audio at the same timeI hated having to always turn it on whenever you got back into the car, and then having to manually pair it on my phone most of the time. But once it was on, it worked pretty well. Unless, of course, it was charging. In sync with the acceleration in my car, it would produce a subtle (but audible) feedback noise while driving. As my speed increased, so did the noise.Fast-forward to today, when I received this unit. At first, it did not want to work. I plugged it into my aux port and charger. It turned on when my car turned on, but I could not connect to it on my phone. I read what "NFC" was, and decided I did not want that. So I restarted my phone. I turned the car back on, and this time it connected.I then decided to drive around a bit. There was no feedback while I was driving, which was a huge plus for me. Sound quality was great, too.I shut my car off, and the unit turned off automatically. I turned my car back on, and two magical things happened. First, the bluetooth device turned on automatically, as it had been doing. Second, my phone automatically connected to it. No manual touching of the device. No having to tap the bluetooth icon on my phone and pair it manually.So for me, this is an awesome device for several reasons:1. Sound quality is great so far2. Turns on / off automatically3. My phone pairs and connects to the device automatically4. No humming noises or feedback sounds while driving, meaning I can leave the device plugged in and not have to worry about anything

It works great. I bought mine in 2019. No on and off switch, but so what? Other reviewers say it's easy to unplug it, but in fact mine has been plugged in for over 5 years full time. I do believe this is no issue since it clearly is not doing any digital to analog converting until you connect to it with your phone and play your music. If it costs a nickel per year to leave it on powering its little LED light I'd be surprised. So for me it's always ready. In all these years there was one occasion when I couldn't connect to it, and I just unplugged it and plugged it back in, and it hasn't failed for years since. I pay for commercial free YouTube premium, and whatever music I can think of to play from my phone to my old stereo system is always there. It comes with a 3.5 to dual RCA jacks cable for your auxiliary or tape input on your receiver, and that's all I need.The problem I now have is that I want another one as a gift to a friend. But whereas I paid about $22 plus tax, they are now asking about 60 bucks and more all these years later! It's Bluetooth 4.1 and has noticeable lip sync latency if you watch a phone video or connect your television to it. But I don't need to do that. It's making me crazy to think of paying nearly triple, but if you don't mind the price it is likely very much the smallest lightest unit of its kind out there. I'm not sure why that makes much matter however, it certainly doesn't justify the new price in my book!

Overall this unit is great but there is ONE issue to look out for -- if you plug it into your PC for its USB power you might get a high pitch noise. This would likely not be an issue if they included a USB cord with one of those bumps that blocks interference, so if you have that issue try one of those. If you power it using the included USB power adapter the audio quality is perfect. It "just works."I'm using it at work with its output routed into the PC so I can hear my phone and the PC simultaneously through headphones.Connection was simple - it appeared in my iPhone's Bluetooth list in settings and I clicked it and it worked, just like that.The device itself is a little smaller than what I imagined from online, which is good. It's smaller than a hockey puck. It's about as big around as a soda can, and half an inch thick.I wanted to rate it 4 stars because it doesn't have an interference-blocking USB cable, but its features are so good aside from that... I have to give it a 5. It's great, especially for the price. It's just not that expensive to be able to connect your iPhone wirelessly to your PC or home stereo.I marked it down to 4 stars for material quality and versatility due to the lack of interference-blocking cable which I believe would prevent the high pitch noise when connected to a PC for USB power... but I do recommend the product.PS. The product feels good in the hand, it doesn't feel cheap. The packaging is very nice, too. The feel is of a premium product.