Sony mobiles launched the unlocked version of xperia m4 aqua smartphone in USA. The smartphone is now exclusively available at amazon retailer in black color model. For now 8GB storage variant is available at online retailer for $349. There is no information about availability of 16 GB storage model for USA. The smartphone has IP68 water resistant, 4G LTE network, slim and light weight design. There are 7 mobiles are available in stock at the retailer. Recently sony released the xperia z4 flagship smartphone in Japan for 93,312 Yen which is equivalent to $755 US dollar.

Refer: Sony Xperia M4 Aqua Full Specifications