Editor's Notes & Price Research
Per the product page: When connecting to an iPhone, the volume control buttons will not work. A gift box and 3x pairs of replaceable earplugs are also included. -Corwin
The Xiaomi Piston 3.0 In-Ear Headphones are on sale at the moment for $15.99 + FS
These are sold for $16 in China so you're pretty much paying what you'd pay in China at this price.
These have a built-in mic and controls - designed for android phones, full compatibility with iOS is not guaranteed.
These sound more neutral in comparison to the 2.1/2.0s. People who enjoy a v-sound signature would most likely enjoy the 2.1s more.
These are also a bit more comfortable compared to the 2.0/2.1s. These don't include a shirt clip like the 2.1s.