Popular Chinese smartphone manufacturer Xiaomi has joined the wearables fray as it unveiled on Tuesday its very first wearable device, a fitness band for only CNY79 ($13). The Mi Band features sensors for tracking various health metrics and can even act as an alarm clock. Xiaomi CEO Lei Jun took to the stage on Tuesday to show off the fitness band, explaining that he had tried a lot of competing similar devices in the past but none ever stuck. In a snub to its competitors, Lei said that Xiaomi has striven to make the Mi Band stand out with a few key features — in particular, it can last 30 days on a full charge, and is waterproof with an IP67 standard. Another nifty feature is that the Mi Band can even unlock a Xiaomi smartphone, eliminating the inconvenience of having to key in your password multiple times a day.