Under the flags of the X-treme series, Sigma produces highly specialized secure smartphones. As the manufacturer himself says, if you are planning a difficult hike in the mountains, down the river or just working in difficult environmental conditions, the X-treme will not let you down. Thanks to several layers of protection, the smartphone case will not break if accidentally dropped from a small height. Protection against dust and moisture will not allow it to fail if accidentally dropped into water. And thanks to a capacious battery of 8000 - 9000 mAh, Sigma X-treme will not go out of exhaustion ahead of time. Plus, some of them support the function of an external battery and, using the OTG connector, can recharge other gadgets.


Metal frames, internal supports, additional protection plates and reinforced glass are usually used to strengthen the cases of Sigma X-treme devices. The corners of the case are usually either rounded or filed, and rubber plugs are placed on top of them, which dampen vibration when dropped. And the camera block is covered with additional reinforced glass. The disadvantage of three-layer protection is swollen dimensions: for example, the thickness of the Sigma X-treme PQ38 case reaches almost 20 mm, and the smartphone itself weighs about 330 grams, which is one and a half to two times heavier than a classic smartphone with an identical screen diagonal.

Most Sigma X-treme devices have mid-range hardware with a Helio A22 caliber processor, 2-4 GB of RAM and built-in storage with a capacity of 64-128 GB hidden under a layer of armor. As planned by the manufacturer, such equipment allows you to achieve the optimal balance between the response speed of the smartphone and battery life. Otherwise, this is a pure middle class: cameras are equipped with one or two modules and are unlikely to be suitable for shooting beautiful natural panoramas, communication modules are limited to 4G, Wi-Fi 5, Bluetooth v 4.0, and outdated microUSB is used for recharging in many models.