146.2% more mega pixels (MP) on main camera than Bird F521. More main camera resolution means better picture quality and detailed photos, which will look sharp on a large screen. (3.2 MP vs. 1.3 MP)
3.0 mm Thinner than Bird F521. Slim mobile phone is easy to handle and looks gorgeous in hand. (100.4 x 51.8 x 13 mm vs. 109.8 x 48 x 16 mm)
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