The battery life is great and it is easy to use. Compared to the other earphones that I have had, they are the best but here are my warning notes:- The magnet force to connect the two while around neck on the chest (not in the ears) is kind of weak. As you walk or run, they get dangle around and fall down.- Just like other sets that I have had, the Bluetooth connection may come with parasites and not as solid as the wired sets (not more pronounced than the other sets but the same problem exists here too).- I wish the did not have the rubber thing for the speakers and they had made it in one piece just like Apple's. For some people like myself, these type of rubber-made earphones tend to jump out.- They are better for listening to the music than tele-conferencing.- They are not the best choice for listening to the music when running/exercising.Most big brand Bluetooth earbuds cost a ridiculous amont of money. But for just 20 dollars, these earbuds have given me a great deal of satisfaction. Compared to my previous set of cheap Bluetooth earbuds that felt clunky and had battery life of around 6 or less hours, these sport a lenghty 15 hours battery life and even last longer when idle. It also does a decent job of blocking outside noice.Sony has good stuff, no? These are found & connected to by the source readily; really good sound; battery life is very good. What else are looking for, at this price?The headphones have above average sound quality with an acceptable amount of audio delay. The pairing process is painless (save for issues pairing with windows, but that's their fault, not the devices.) Keeping it paired with multiple devices and switching between them is relatively easy. However, there is a minor audible hiss in the background when no audio is playing. Oftentimes, this hiss will only last a short time before cutting to silence, however, other times it will remain indefinitely as long as there is no playing audio. That, however, is a minor complaint compared to the issue with the battery percentage notification. It is effectively useless to actually determine the level of charge. The device appears to use tiers of charge regardless of it stating a percentage. If, for example, your battery is at approximately 51%, the device will claim it is 70%. If when that charge drops below a threshold will it change. It always declares that the charge is the higher of the thresholds, meaning that if the charge is above 70% it will always say it is fully charged, and when it is below 70 but above 50, it will claim it is 70% charged. This makes accurately determining when it is fully charged impossible as the claim of "fully charged" only actually tells you it is above 70%.If you disregard the absolutely heinous charge level indication, the battery life is pretty great. I get a full two days of moderate on and off use before having to charge them. I can't confirm that the 15 hour claim is true due to never having used them for that long, nor counting exactly how long they get used per day comparatively, but they appear to have a very good battery life regardless.The magnets honestly may as well not be there for how weak they are. They'll stay together if you're just sitting in a chair, but as soon as you move around, they immediate separate. This isn't as much of a problem for me, due to me basically never even wearing them if I am not using them, so I never actually have the need for them to be hanging connected to eachother, but if you intend to be wearing them and not using them, you may want to get some kind of clip.The flat cables are not attached parralel to eachother, so when attached together via the (very weak) magnets, the rotate in one direction or the other making them dangle a bit off to the side. It's a meaningless gripe due to me never even using them that way (as mentioned before) however it may be a problem for you.They are very susceptible to earwax. There is a teeny tiny hole in the center that, if even slightly covered with any amount of wax, will immediately dampen the sound to imperceptible levels. It's easy to fix with a needle or even your pinky nail, but if you let that build up over time or just have waxy ears, I can see that becoming a hard issue to overcome.Other than those issues, I am still very satisfied.Excelente producto muy cómodo y fácil de usarThey are okay everyone keeps telling me I sound muffled when I use them to talk.So I replaced a set of BeatsX because at over $100 each time they broke, i was geting annoyed. These are value priced... and you get what you pay for.Pros:- Battery life is GREAT- llike beats, you can do a quick charge for about 10 min and get a few hours- if you already have USB-C devices, it's easy to charge up for a few min- the power on/off, pairing, and battery life voice sounds they make are very helpful, i wish beats did that.- once they stop receiving sound to play, they go into a bluetooth low-power mode, that let's they stay connected, but doesn't drain battery almost at all. this makes them the longest lasting earbuds i've ever had. i listen at night to ASMR before bed, and in the morning they're still connected and i listen to music all day. Battery life is great.Cons:- Cord is very uncomfortable, it slides back and forth on your neck, and the mid-sections are thick and annoying because the buttons are very hard and rough.- the buttons are made of razer blades, i don't understand how sony can make BUTTONS be thin tiny plus and minuses and one big minus. it's impossble to tell which button your finger is on by touch, there's just nothing to feel, they are so thin and so brittle they feel like you're just running your finger over a knife, pressing them is actually HARD to do, you have to dig your finger nail into them, and they don't give much. the middle button which does EVERYTHING is hard to figure out which one it is too.- the main button is confusing. it turns it on and off, but beyond that it doesn't work consistently. Pressing it doens't PLAY or PAUSE on an iphone, pressing and holding doesn't launch sirri, tapping it once, twice or three times, does NOTHING. if you press it JUSSSSST RIGHT as in press and hold for almost a second, it'll do play or pause. to turn it on or off, you have to press it for about 3-5 seconds. to do pairing, you have to hold it for 5+ seconds.- there's no way to skip or fast forward on iOS. I've tried and nothing happens. why they couldnt do like every other set (double tap to skip, triple click to skip back) is beyond me. trying the tap tap-hold like fast forward on apple earbuds and beats and others, usually just turns these off. I don't know if this is by design or defective.- not every USB C cable fits in it's plug because the cover flap and the housing gets in the way.- you can't do multi-point connect. It SAYS it can on the box and manual, but it can't, while it's connecting to one device, anything else can't connect. If you put it in pairing again, it'll connect to the new thing and disconnect from teh last device. this doesn't make any sense since it says how to do this in the instructions, yet it doesn't work.- though they LOOK like BeatsX, they don't have a semi-rigid band on the neck, it's just loose cord, so it swings and pulls on your hair and gets uncomfortable if they fall off your shoulders.- you can't listen to one earbud by itself, the weight of the whole set pulls it out of your ear.So all in all, they are a net positive, but I wish Sony would make some premium buds in the EXACT same style, with this small of a bud design. I'd gladly pay double.Just in case you're curious if I got a bootleg counterfeit or not? I registered these with SONY, and they're legit. so maybe defective, but not fake. so that's at least good.La batería tiene buena duración, la correa es muy larga, la conexión falla mucho, los compré apenas en febrero y ahora en mayo ya falló uno, no los recomiendo ni los volveré a comprarLos audífonos me costaron muy económicos en $622 no tienen la mejor calidad de audio del mundo, sin embargo el sonido es claro y nítido, en llamadas se escuchan bien, con un buen micrófono, básicamente los compré para utilizarlos como manos libres, son sumamente delgados y cómodos.I have an old pair that I bought at BestBuy which I've had for a couple years. I've used them daily without issues and they had excellent sound quality. That old pair is starting to have problems with one earphone, so I decided to get the same ones to replace them because they were just so great.This pair that came from Amazon had serious sound problems - it is extremely echo-y and noisy. The sound is also very distant - sounds almost like a blown speaker.This is the second time I've had issues with earphones from Amazon. I was starting to wonder if Amazon perhaps just got a quality control issue batch...but after reading reviews from other retailers, these earphones seem to be having this exact issue consistently and across the board.Too bad, the pair I got two years was amazing.I believe my first pair lasted about 2 years before having issues. But those issues weren't sound related.The range of the Bluetooth is great. The quality of voice chats when calling or on internet based services is clear. The finish is nice. I often wear them around my neck when I'm out and about for in case I get a call. The battery is very impressive in standby!I don't know why it is "noisy". I changed it to Stereo and it was good. But I can't get the mic on when it is on Stereo. Overall, a little disappointed. It isn't as seamless to use, at least on my Windows laptop.