Neoteck Portable 3.5mm Headphone Amplifier with Bluetooth 5.0 Receiver, Two-Stage Gain Switch, 16-300 Ohm HiFi Earphone Amp, Aluminum Matte Surface

I bought this for my old 2007 Toyota Solara SLE Convertible with the "premium" JBL Nav head until. I found the Aux amplification for this JBL Nav head unit was fairly low (I have a Solara is non-nav to compare it to) and while the head until has Bluetooth, it is only for phone calls (odd decision on JBL/Toyota).First off, It is interesting that it Bluetooth in this Amp is ready to connect as soon as it is powered on, while that surely makes it easy to connect to, I wondering about other random jerks connecting or being able to have a passenger to connect instead of me... I guess time will tell.I have the amp set to low (L), and I just turn it up all the way when powering on, and it is more than enough to overcome the Solara's deficient JBL Nav amplification on the Aux input. I do have power supplied (all times) and while I have a BESIGN Ground Loop Noise Isolator between this Bluetooth Amp & the Aux, I am hearing no whine/buzz. The "old" Amp and separate Bluetooth units I was using before, I did hear a very slight annoying power whine, even with the ground loop noise isolator. It seems all these little amp units could be designed for ground loop noise isolation, it couldn't add that much to the final cost. Anyways, buying a separate one like I did months back, isn't a big deal either.I now have less things to power & various audio/power cables to run in the Aux cubby area - so the cubby area is much cleaner. The size is perfect for the cubby too and as far as I am concern it sounds great. You can't really see it in my cubby, and I love that.

Why did you pick this product vs others?:This little amp is of substantial build and quality. The price point for this amp is amazing for the quality, simplicity of use/features, and even had a small LED display that lights up the manufacturer's logo that rotates colors. The Bluetooth functionality and connectivity is seamless. The extra power/amplification of the aux line signal before going into the aux/input in factory CCC BMW headunit is amazing. The factory Logic 7 sound processing system was already good, but this little amp makes the factory system beyond better but exceptional. The extra clean power makes the drivers / speakers sound so much cleaner and tight across the whole sound stage. If this is the "junk" that China makes, then this example of junk = quality at a remarkable price in my book.

Sounds great but the battery didn’t last as long as would have liked it to.

I dont have an intercom in my helmet. I have a nice pair of JBL speakers. This connects to my phone via Bluetooth. I drop it in my riding jacket pocket. It boosts the volume without distortion so that even at 80mph down the highway the sound is awesome.

Arrived quick. Easy to install. Works wonderfully. My music is clearer than anything I've listened to before. Love it.

The unit is now making a clicking sound on the left channel. I can hear what sounds like a capacitor charging internally. Further, while the units bluetooth works when next to the computer, it cuts out when in the pocket and the playback will not resume unless I play/pause the cell phone. This does not happen on either of my other bluetooth devices, and I'm using a new phone with Android 11. I will send the unit back.-----------The unit itself is wonderful. Three flaws:1. The attached auxiliary cable is one of the best looking cables I've ever seen. It's unfortunate that it's of such poor internal construction that it can not be used. The other reviewer is simply right on this. I'm kind of disappointed they would just send me trash. Just throw it away and discount the unit if it can't be used.2. I wish however that the usb-c charging port had a DAC built into it. A USB DAC can be had for $5. This would add a ton of value and performance to this.3. It needs a lossless bluetooth codec. Please add support for aptX. Headphones with aptX codecs can be purchased for $30. I would like that ability in this receiver too.If they spent another $0.50 on this beautiful, but useless, 3.5mm cord; and, if the unit had a DAC and aptX we'd be talking about mid-ranger gear. If they added play/pause next/back buttons, you'd be talking about a $200 unit. So the guts of this would kill the market with another $10 of hardware. It's just a missed opportunity.