https://www.ubergizmo.com/products/lang/en_us/devices/blade-a520/
ZTE Blade A520 Specs & Speed
ZTE Blade A520: 5-inch (1280x720), 8 MP Camera, 2400 mAh, MT6737 Processor (2 GB)
zte blade a520specsspeed
https://www.ubergizmo.com/products/lang/en_us/devices/zte-blade-a521,blade-a520/
ZTE Blade A521 vs. ZTE Blade A520 Specs & Speed
ZTE Blade A521, ZTE Blade A520: Technical Specifications and Speed/Benchmarks comparison (Camera, Processor, Memory size, Price and Features)
zte bladevsa520specsspeed