.What a catchy Name: ATH-SR5BT. SR stands for “Sound Reality”. Let’s call them ATs.Clean, clean sound. Not super loud, but enough so you aren’t always itching to turn them up to eleven. Not for bass heads and I could have wished for a little more, but still very good at this price point. Beautiful construction; I can’t emphasize that enough. Small and light. Quite comfortable unless I wore glasses. Excellent controls unlike so many BT headphones that are finicky and fiddly. Fast and easy initial pairing. When pairing or re-pairing to a new or previously registered device, be sure EVERY other paired device has bluetooth turned off or is out of range, because these ATs stubbornly cling to the last known device. Battery seems to last. Worked flawlessly with iPhone, great microphone for calls. Paired to my TV with fairly good sound.Sound: To my chagrin, age has robbed me of high frequency hearing over 9K Hz. So look elsewhere for a nuanced judgement. But I can say if you are a bass head, skip these . But for me, the bass felt clean and tight; Really a pleasure. There was accurate bass right down below 30 Hz. Not loud, but there. Up at 40 Hz or so you start to get real bass. I think being on-ear instead of over-ear costs in the bass department, but that is an inevitable compromise. Midrange felt really accurate. I give these a “B” grade, or, for the price, an “A”.From what I can tell, very good detail in midrange. Obviously, if the ATs claim high resolution capability, that has to come through the supplied 4' cable. Blue tooth gave great results that I could not hear as being any worse than being cabled, but what do I know (or rather hear)? At this point, that BT isn't as good as cable. Still, they sounded great. As for Hi-Resolution? Personally I think the whole Hi Res thing delusional... even if I had the ears of a 20-year-old. I rely on rigorous double-blind tests for that opinion. Does anybody need headphones that go up to 40Khz? I've heard the arguments and I think not. Your opinion may vary. Obviously if Audio Technica is bragging on Hi Res, such a capability, then they are praising their clarity right down to the bass, but especially at high frequency. I’ll let Golden Ears chime in on that. I can tell you I walked with them for a couple hours and the music was never fatiguing. So much better than my V-moda buds, which I quite like.-Initial charge is supposed to take up to 5 hours. It only took 2. REALLY hard to see indicator light turns from red to blue once you are fully charged.-Power switch on right side gives a down-note when turning off and up-note when turning on. It gives a chime when bluetooth connection happens. I found the sound cues more useful than the microscopic indicator light.-Auto power-down after 5 minutes if no signal. ATs reset to medium volume with power off.-The battery goes for a long time.-These on-ear headphones exert some pressure but I could wear them forever without glasses. With glasses about an hour. Sound isolation? Pretty good for on-ear; They sounded kind of like I was underwater as I walked around outside.-Pairing is fast and easy. The ATs search for a device each time they are turned on. They will remember the last device so make sure that device it is turned off or out of range if you want to switch from, say, your phone to your laptop, or pair to a new device. ATs can remember 8 devices. When you power on the ATs they pair to the last device within a few seconds.. If that device is not found, they go into discovery mode and pair to whatever you have open. I'm paired to a desktop, an iPhone, an iPod, and my Panasonic VT60 TV.When I turn on the ATs near the Panasonic TV, The Panny senses the ATs and pairs within seconds. So easy... as long as last paired device has BT turned off. Sometimes I have to hunt around and turn off 2 or 3 devices till the ATs will switch to discovery mode. With my TV, for some reason the fidelity is just a shade less than my Sennheiser RS120s; Maybe it's the 12 foot distance or that the Sennheisers are using between 863-927 MHz RF. On the other hand, there is sometimes some hiss with the Sennheisers, and none with the ATs. I can get the traditional 30 feet away or a little bit more before the sound breaks up. If I walk to the room behind the metal chimney, range is half that.Using bluetooth on your portable device? Have a backup battery for that device.Phone performance: Best external microphone ever. No fast forward/reverse but everything else worked well. My callers could not tell I was using a mike on a cord.I did not use the NFC link. I wish my Apple devices had them. Many Androids do. Any iDevice that has Apple Pay has NFC, but Apple, as far as I know, just limits it to Apple Pay. Too bad. From what I can understand, NFC is just used for really fast and automatic Bluetooth connection, but once connected you are still listening over bluetooth.