Operator KDDI announced the launch of the first Firefox OS smartphone targeting the Japanese market, with the device also seeing the introduction of a number of new technologies including 4G support and HD display.

Called Fx0, it is manufactured for the operator by LG Electronics. It is powered by a 1.2GHz quadcore Qualcomm Snapdragon 400 processor.

The operator said that due to the device’s support of open web technologies such as HTML5, “various network devices can be connected via the Fx0”. It includes a web server function developed in part by KDDI.

A simple local network can also be created by touching Fx0 devices together, and a webcast function allows content sharing such as playing video, photos and other digital content within this.

Fx0 has a 4.7-inch screen, 1.5GB of RAM and 16GB of storage (with microSD expansion slot). It also features 8MP main and 2.1MP rear cameras.

Designed “under the supervision of world famous designer Tokujin Yoshioka”, it is said to have a “futuristic feel”.

It will be available online and through some stores this week, with wider availability early in January 2015.

According to Mozilla, the launch means that a total of 16 Firefox OS smartphones are available in 29 countries.

But to date much of the focus has been on entry-level devices and emerging markets, meaning KDDI’s launch – and its positioning of Fx0 as a hub for developers – is notably different.