Sony Xperia XA1
Part of the Xperia X Series , the device was unveiled along with the Sony Xperia XZ Premium , Sony Xperia XZs and Sony Xperia XA1 Ultra at the annual Mobile World Congress in February 2017 . 
<triplet> Sony Xperia XZ Premium <subj> Xperia X Series <obj> part of the series <triplet> Sony Xperia XZs <subj> Xperia X Series <obj> part of the series