Nulaxy Bluetooth FM Transmitter, Wireless Radio Adapter Hands-Free Car Kit with 1.8 Inch Display, QC 3.0 & 5V/2.4A, USB Drive & SD Card Aux in & Out

Thanks to all of you who answered my many questions before I purchased... At first I thought this was the best $20 I've spent in a long time. It looks lovely in my all black car interior.... almost like it was built-in! The musical sound was crisp and clear initially (when sitting still in the driveway), and the sound when paired with my iPhone for cellular use was good too. No problems with picking up a call, hearing or disconnecting and I heard from a caller that the sound was very good. It was simple to set up... a child who can read could install it! (even if I'm the one that did it.) I purchased a TF micro SD Card and Adapter to use with this and on first look, I thought I'd made a mistake because all I saw was a USB port on the right side of the display. I could not find a slot large enough for the Micro SD Adapter Card. Then, just when I was about to get upset, I noticed a tiny slot on the left side and the micro card fit right in... so all is well! (You do not need the adapter except to use in your computer when you transfer your music!) It would be helpful if the vendor's listing explains all this... but it doesn't.UPDATE: After some road use on a 30-mile trip, I'm rethinking this purchase. I'm getting a lot of static when moving, and it's almost impossible to get this SD card out! I'm having to use tweezers! And, another troublesome issue is that if you think you can change songs on your SD card while driving, think again. If you have multiple folders, it takes some serious studying to scroll through the folders, and slect the songs... so much so that you'd better pull over. Would be nice if you could project the screen of the transmitter to your phone or the radio dial... but I can find nothing about that. So, now that I'm really trying to USE it... I'm not so happy and will probably send this back! It seems way too much trouble to operate, and I can find no resolution to the static.

This Nulaxy KM29 works great for listening to streamed media and being able to hear navigation apps in my 2007 Ford Taurus that predates Bluetooth being widely available built-in to vehicles. Calls come through loud and clear too but I have been told I need to speak louder when using the built-in microphone.The factory stereo system is not very loud in that car but this KM29 transmits with plenty of power. It's as strong as the best radio stations in my area and will even mask weak ones. For instance if I set the transmit frequency at home to a frequency that is not receiving any signal and then drive 20 miles and turn the KM29 off, I will often notice that there IS a signal being received at the new location that I couldn't hear at all with the KM29 on.The micro-SD (or trans-flash, "TF" as the description calls it) reader works well too. I had no trouble navigating a couple layers of folders. It will even shuffle all songs on the card.I have not used the line-in jack or the USB reader but they are nice options to have. Neither have I used the available Quick Charge 3.0 as it is not compatible with my phone. But, the 2.4 Amp USB charging port does charge my Motorola e6 as quickly as the original home charger.If this broke or stopped working I would very likely try a different Nulaxy model but would also consider re-purchasing the exact same one.Here's what I wish was different about the KM29:- The screen is very bright, which is necessary. I have no trouble reading it on bright sunny days. BUT, I drive out in deer infested rural areas at night sometimes and it's SO bright that it blitzes my night vision. I try to minimize this by turning the screen away from me, but a screen dimming option would be sooo helpful.Please consider this NULAXY. A 50% brightness button....- The one other thing that has been a problem is I have difficulty after receiving a call, transferring the call off of the device. Maybe it's because of compatibility between the KM29 and my Motorola phone or the particular Bluetooth standard and profile used, but it constantly wants to reconnect and won't let me power down the KM29. I have to physically pull it out of the power socket to get the audio channel to revert back to my phone after a call is connected.This can be very frustrating when you receive a call and you are just about to get out of the car. Particularly, if like mine your power outlet stays on even with the key out of the vehicle.