Bluetooth audio lags badly enough that in its plain vanilla form it's sorta useless for anything but listening to music, where if it takes a moment to start playing that's not a big deal. That's where aptX from Qualcom comes in, reducing latency. AptX also comes in a few versions, including aptX Low Latency [or LL], which cuts delay to around 30 ms.
aptx[.]com
One problem with aptX is that there's not a lot of info out there -- about all you can do is look for products that advertise aptX ll, though that's no guarantee, e.g. aptx[.]com lists the Samsung Note 4, but not newer models that have it. Windows 10 apparently supports aptX ll, but the only docs you'll find is one listing what should be in Windows 10 devices, with no word on hardware or drivers. My 10" Windows tablet apparently supports it, but the only way I can tell is that after pairing a device with aptX ll, there's no noticeable lag watching video. When you pair a Bluetooth audio device with aptX ll, it'll start by trying to connect via aptX ll, fall back to aptX if that fails, then fall back to not using aptX at all -- some devices tell you that they connected with aptX ll &/or aptX, but most do not.
I did see posts on-line saying that CSR4.0 Harmony software had to be installed for aptX to work in Windows. I did not install it. It's a large download available on the web sites of some manufacturers that make Bluetooth dongles, dates back to 2012, & I'm not sure that it's strictly legal if you didn't buy one of those dongles, presumably paying the license fees as part of the purchase price, so I didn't include links.
There are a few generally lower priced Bluetooth USB dongles that include aptX support, but reviews on Amazon etc. aren't great. Creative Labs [the Soundblaster folks] has a USB dongle [~$30] that's part sound card, part Bluetooth audio transmitter, that reportedly will only connect to Bluetooth receivers with aptX ll. Amazon sells quite a few transmitters, transmitter/receiver combos, & receivers, but I had terrible luck for whatever reason searching using aptx in the search terms -- I wound up just wading through their listings looking for aptX.
From what I can tell so far, & I may well be wrong, it seems these products are one of those cases where you are buying cheap electronics devices, regardless their asking price, so you get cheaply made goods with questionable quality control & longevity pretty much regardless how much you pay. So I stuck to the lower end price-wise, least for now. I bought a small [1.5" square by 3/8" thick] rechargeable receiver that seems to work pretty well for about $16, though the directions that came with it are wrong, & I'm a bit dubious regarding the main push button switch -- it may wind up lasting years, but it feels Really cheap. I paid about $30 for a transmitter/receiver that had both a standard headphone type jack & TOSLINK -- UPS is going to pick it up today & deliver it back to Amazon, since the TOSLINK is unusable. Using the wired connection seemed to work pretty well, so I ordered a replacement without TOSLINK.
The receiver plugs into headphones or speakers using a regular headphone type cable, & came with a solid metal adapter with a male headphone plug at both ends -- that way the receiver just hangs off the headphones, or you can use a longer cable & clip the receiver to your shirt, stick it in a shirt pocket etc. Using it with my V-Moda headphones the sound isn't as good as wired, but it's pretty close, & it sure beats paying $300 for a pair of their current Bluetooth headphones. Using cheaper [$15] headphones I couldn't tell any difference, wired or Bluetooth. I don't know yet how long the receiver's battery lasts before recharging, but from reviews expect somewhere between 3 - 6 hours, & the same for the transmitter. You can use these plugged in while charging, but some people can hear white noise or static while charging, and many of the sellers on Amazon make conflicting statements, both that you can use them plugged in, & that you shouldn't.