Nulaxy Bluetooth FM Transmitter for Car, 1.8" Color Screen Wireless Radio Adapter Handsfree Car Kit with QC3.0 & 5V/2.4A Charging, Support USB Drive, microSD, Aux, EQ, Car Battery Reading –KM29 Silver
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|Wireless communication standard||Bluetooth|
About this item
- [UPGRADED LANDSCAPE SCREEN]: KM29 with 1.8” TFT color display screen and buttons offers a wider visual interface for more information. Output QC3.0 fast charge port and 5V/2.4A USB port; rotate the gooseneck 350-degrees for a comfortable viewing angle.
- [Multi-Functional]: Supports incoming call announcement, fast-forward & fast-backward, 4 music input sources, and 5 EQ play modes; The Nulaxy KM29 has a built-in microphone and supports hands-free talking and private calls.
- [Crystal Clear Music from 4 Sources]: Supports Aux/ Bluetooth/ USB/ TF Card. KM29 car radio transmitter adopts advanced interference and noise cancellation technology - CVC technology creates full duplex sound and suppresses noise and wind.
- [Extra Features]: Plug-in or press any button to power on. Smart QC 3.0 USB charges compatible devices up to 4x speed of the conventional car charger. Built-in over-current, over-voltage, intelligent temperature control and short circuit protection.
- [Safety Functions]: Safety first. The KM29 is equipped with a voltmeter to show you the condition of your car battery. Voltage should be between 13.2V to 14.7V when your car is on and moving. 12.2V to 12.8V when your car is parked and ignition is off.
Product detailsColour Name:Silver
- Is Discontinued By Manufacturer : No
- Package Dimensions : 14.22 x 10.41 x 6.6 cm; 113 Grams
- Date First Available : 18 December 2018
- Manufacturer : Nulaxy
- ASIN : B07LGSVBC5
- Item Model Number : 5962922766
- Best Sellers Rank: 138,317 in Electronics (See Top 100 in Electronics)
- Customer Reviews:
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I give the product solid marks because when it DID work, it was exactly what I was hoping for. The screen display was vivid, it was loud, clear and the connection was stable/solid. If the product was still alive I’d rate it 5 stars, however, I’m giving 2 stars due to Nulaxy standing behind their product and being flexible to replace within the warranty window. I’d recommend taking the extended warranty option, if available, for additional peace of mind.
Still has whistling noise after 30 minutes of use after trying various things.
Since the warranty expired i decided to split the cigar lighter adapter case and take a look inside.
First thing i found was an obvious cold solder joint where the cigar lighter ground clip is soldered to the printed circuit board. It was so bad i could wiggle the clip away from the printed circuit board with my little finger.
This is a large piece of metal which quickly sinks away heat from the soldering process.
Re-solded the ground clip firmly to the circuit board.
Put it all back together and THIS had to be causing the whistling problem...WRONG!
Still whistles after about 30 minutes of use.
Next i thought some component in the head unit was overheating.
Didn't want to split the head unit's case so decided to create some vents using a small hot nail for melting some vent holes in the plastic case.
NOPE...still whistled after about 30 minutes of use and i noticed its much worse in hot weather.
I did find out conclusively that the whistling noise frequency varies directly with the tachometer's rpm frequency.
I highly doubt this is due to my Jeep's electrical system because the KM29 works flawlessly the first 30 minutes or so.
And my old KM18 exhibited the same whistling but to a much lesser extent. In fact i didn't notice it until i tried using it again after my KM29 experience.
So after re-soldering cold solder joints, trying different flash drives, creating vent holes and a shielded audio cable, i give up.... the whistling is still there.
Gonna try another company's device but they all likely use the same chip set and similar circuit designs.
Maybe there's a defective or wrongly spec'd component thats sensitive to heat build up or needs better shielding or better noise filtering.
Too bad as the KM29 has all the inputs and outputs i need, easy to use, big display, bigger control buttons and sounds fantastic that is for the first 30 minutes.
First some background.
The vehicle is a 2K Jeep Cherokee with OEM radio using its audio input jack.
I only use the USB feature, never used or needed the FM transmitter feature.
Upgraded from a Nulaxy KM18.
First the Pros.
This unit is much easier to use than my smaller KM18.
The larger display is easier to see and i especially appreciate the larger control button for my fat fingers.
The audio is about as good as it can be for an older vehicle EXCEPT.....read below.
Now the Cons.
The first unit's display developed a white vertical line after a few days use.
Not a big deal at the time as i've had to return defective products before and probably will again in the future.
Amazon quickly sent a replacement in only a couple days. Thank you Amazon for the fast turnaround!
Now for the 2nd and current unit.
I had high hopes when first trying out the KM29 because of the ergonomic improvements compared to my KM18.
First problem using a mini USB thumb drive with MP3 music folders and the included audio cable.
At first everything seemed to work ok, great music quality, easy to see display and bigger control buttons.
Then after playing music for about a half hour, the unit developed a high frequency 'whistle' noise through the speakers.
The whistle got louder as time went on to the point listening to the music was unbearable.
So much for signal to noise ratio.
Interesting to note that high frequency noise appeared during heavy engine acceleration. The harder the acceleration the louder the noise.
Its not ignition EMI as the noise frequency is way too high i'd guessamate around 2 to 4 KHZ.
My guess at this point is EMI noise transmitted from the OEM instrument panel's electronic tach, speedometer or the OBD-II connector under the dash.
Or it could possibly be alternator noise coming through the 12Volt cigar light but i doubt that.
Not one to give up, first thing i tried was another larger thumb drive. Seemed to improve things by cutting the noise down maybe 20%. Still the longer the unit played music the louder the noise during acceleration but not as loud as with the mini thumb drive.
Next thing i tried was to order a shielded audio cable through Amazon.
With the larger USB thumb drive and the shielded cable that cut the noise down i'd say 90% during acceleration but it was still faintly there during the quiet period between song changes but at least its tolerable.
Also when the first unit worked it had the same noise issue.
Not saying this will happen with other vehicles, your noise mileage may vary.
But these things are intended to work with older vehicles.
Next the random feature.
Don't know what algorithm Nulaxy uses but its junk.
It tends to replay the same song a few songs later.
Now that i've had some time using this device, the random feature tends at times to play songs in the same folder also.
This random feature is not a true shuffle from what i can tell.
IMO every time random is enabled or at power up, it should be a true shuffle not random with songs playing in the shuffle list.
Another annoying issue, when the equalizer option is chosen, the equalizer option is NOT saved into memory for the next power up.
The goose neck.
I think because of the heavier weight of the head unit the goose neck has a problem supporting it.
My lighter KM18 didn't have that issue.
As mentioned i used a full size thumb drive in order to reduce the high frequency noise during heavy acceleration.
It worked a little but the heavier thumb drive added to goose neck to sag.
Improvements i'd like to see.
-Possibly heat vents in the head unit.
As i mentioned the noise appears to get louder the longer the unit is on.
Could be the larger display uses more power and dissipates more heat than the smaller displays.
And that dumb audio frequency constantly displaying doesn't help a heat dissipation issue.
-Full EMI shielding including the head unit, the goose neck and the cigar lighter adapter.
-DC power high frequency filtering.
-Shielded audio cable.
This coupled with the larger thumb drive greatly improved the noise problem.
The included audio cable is garbage at least with my situation.
-More sturdier goose neck to support the larger head unit.
-Scrap that audio frequency display or at least make it an option for those who like it.
Instead display more and larger text information regarding the song currently playing.
Or even though its a small display at least give the option for album art.