A lost Huawei Mate S will answer you if you call out for it
So let's say that you've set your keyword to 'Mate." If you can't find your handset, you merely say "Hey Mate," followed by "Where are you?" Your Huawei Mate S will then vibrate, set off the flash, shake some more, and then play some music. While the music is bouncing out of the speaker, you can hear the phone say repeatedly, "I'm here."
It will be interesting to see if Huawei includes this feature on the Huawei Nexus 6. The manufacturer's first Nexus handset is expected to be unveiled on September 29th with pre-orders rumored to begin on October 13th.
The video below shows the "Find Your Phone feature, but on the Huawei P8. It works the same way on the Mate S.
source: Huawei via AndroidCentral