OnePlus 2 features an old design meant to put it as a classic phone compared to its competitors, and the handset incorporates an al-plastic chassis.
The OnePlus 2 features a revamped design meant to put it at the top with the rest of its flagship competitors. 
The handset incorporates an aluminum-magnesium alloy chassis, with the volume and power keys along with the new notifications control switch featuring a polished stainless steel accent and with the rear of the phone accompanied with a textured Sandstone Black plastic back cover. 
