This is the first pair of headphones by Xiaomi, who have previously gained their popularity with a series of pistons and their earbuds. They were  announced in January, but only came out this April.     Those headphones were marketed as a custom-made gadget for the Xiaomi RedMi phone, but they did a pretty good job as headphones for my Mi 4 phone where I tested them. Designed as high-end phones for mobile devices, they will also do a great job as your regular headphones, for travel or even gaming.   Performance   The headphones are said to...