Fast service, and a wonderful entry level iem for $10, was really impressed, wait, surprised at how it really sounded. It's not a bass heavy iem, but the lows are lifted slightly and it's enough to satisfy me and give some nice rumble, upper mids are forward, so vocals are not recessed but it's not overly done, and these can get a touch bright on some songs but not harsh to my ears as the low end does balance these out. Detail is good for the price, you're not going to get the detail from like a $100 set, but still for $10 they're really nice, just very surprised.
Definitely punch above their price, the bass is a bit boosted but not too boosted, I've used them with my FiiO Q1II, mids are a bit recessed but if used with the right dac/amp they can be brought back to life, highs are accurate, not harsh surprisingly, a bit sparkly,, the boost around 2khz adds a bit to the sound stage of them, it's nothing compared to open back headphones but for in ears the sound stage is great, imaging is decent not the greatest but you can distinguish some panning and such, not too much depth there, however the frequency response is overall a fairly "fun" one, enjoyable.