AirSync – Wireless XLR Transmitter and Receiver, UHF Wireless Microphone System for 150ft Range, Rechargeable Wireless Microphone Adapter for Dynamic & Condenser Microphones, Mixers, PA System, USB-C

These are the ones you want!
Trouble-free, easy to set-up, great audio quality, battery life. I have used two competitors and these are superior, even though they cost less. I use them in line mode between an Allen & Heath mixer and a pair of Bose Pro16s. They are the first transmitters that I can use while they are plugged into a USB charger without hearing the charger at all. I love mixing from the back of the room with no cable runs!On the front side, the airy tonal quality of a Neumann KMS105 comes through beautifully in mic mode, while freeing up our singers to roam the stage or the entire venue. Plenty of battery life for our 4+ hour shows while providing 48VDC for the condenser mic. Do be careful to ensure the XLR cable connector is latched! Lead singers can get real physical when unleashed from the cord…I have not used these long enough to know if they improve on the sketchy reliability of their competitors, but the initial impression of quality is remarkable at this price point. Happy Dance!

Failed transmitter, excellent warranty replacement service.
This review is more for the quality of the warranty service.I had this transmitter/receiver unit for just short of 4 months. Fabulous performance as a wireless mic. No complaints.Unfortunately, recently the transmitting unit stopped working in the middle of a performance.I reached out to the service department and I could not be more satisfied with the response I received.I did not object to providing a short video of the failed transmitter, to document the problem, which was the failure of the unit to turn on even after an all night charge.I was approved to file the claim under warranty and I was quickly informed a replacement transmitter was on its way.However, one would think the unit should not have failed in the first place.

looks good: 80-10kHz, <0.5ms
I'm using this for satellite speakers at live gigs. So I wanted to know what the frequency response looks like, and how much delay they add. I used pink noise in logic and compared a wired XLR connection to the AirSync (using both to go out of and then back into my mixer).In the frequency plot, the red line is the wired XLR, and the white line is the AirSync. They match from 80Hz to 10kHz, with only a slight drop-off outside that range. In the time plot, the wired XLR is on top, and we can see that the AirSync starts less than 0.5ms later (or about 6 inches later for sound in air).So when I'm getting the satellite speakers that are closer to the audience to align with the mains, almost all of the delay will be in the mixer.

Not recommended AT ALL.
2nd UPDATE:The company reached out to me and sent me a replacement set to try. I have to admit, it wasn’t that bad. It primarily worked this time just fine. I will continue testing.UPDATE:Used outdoors in a clear environment far away from any urban city, group of 100 people event, and these FAILED miserably. I was embarrassed. Constant “fwhip fwhip” noises as people talked or moved slightly. I tried changing the freq several times. I did not have a freq scanner, but no channel worked well. Sometimes even the audio just cut out mid sentance for 2 seconds randomly.Even when someone was standing TWO FEET away from the receiver it acted this way.I cannot recommend this anyone.Latency is really really good. less than 1.5ms compared to 5.5ms for XVive.XVive is flat 20-20, so can be used as a measurement system alternative wireless. This one cannot. The phase and roll off at low end are way too much.This would be perfectly fine for a vocal mic though.The transmitter/receiver device itself is too large to fit in a standard side-by-side in a regular mixer/input panel. So, you cannot use one consecutively in each channel, 1,2,3,etc.The power button is too exposed and can accidentally be turned off or on inadvertently.This looks like a branded version of something that is available or has been knocked off already. I have not tried the off-brand version, but I suspect it is identical and cheaper.