5210的“三防”概念在它独特的外观上得到了明显体现。它的机壳是采用特殊的软硬胶材质混合制作，大大增强了防撞击能力，从而达到“三防” 中的防震目的。5210的机壳接合方式与同门师兄弟前后机壳接合不同，采用的是上下机壳接合，密到程度很高，除了听筒和蜂鸣器部位开了几个孔用来传递声音外，整台手机上 5210’s “three defenses” concept in its unique appearance has been clearly reflected. Its case is made of a special mixture of hard and soft plastic material, which greatly enhances the ability of anti-collision so as to achieve the purpose of anti-vibration in the “three defenses”. 5210 chassis engagement with the same door brothers before and after the chassis engagement is different, using the upper and lower chassis engagement, dense to a very high degree, in addition to the earphone and buzzer parts to open a few holes for the transfer of sound, the whole on the phone