This size ONLY for iPhone 7plus 6splus/6plus,NOT for iPhone 7/6s/6. The case looks like and about the same thickness and weight as a basic shockproof protective case,but it has a ultra-thin Built-in Qi wireless charging receiver and charging port on the tail of the case.(This case is not battery case.There is not battery inside.) The wireless charging current is DC 5V/1000mA (max) ,comparable to plug-in lightning cable charging speed. Notice before purchase: 1. The lightning port of the phone shall be able to work normally. Though some charging cables can be used for charging if there is serious wear, the product may fail to be used regularly. In such case, it needs to be cleaned or even replaced before use. 2. It has relatively higher requirements for the wireless charging pad and the power supply current of the base are than that of the phone with built-in wireless charging function. It is specifically reflected in the accessories that can charge the iPhone with wireless charging function (such as iPhone8, X, 11, 12, etc.), but may not suffice to support the normal operation of the wireless charging case (the power supply current of the wireless charging base is close to 5V/2A or above for its normal operation, and meanwhile, the position should be more aligned to the center). 3. If the charging cable can achieve normal charging after plug into the original lightning port on the iPhone, but fail to do so after plug into the lightning port of the case, a more reliable charging cable needs to be replaced. There are very few phones that can't work properly with the case finally,Even if your phone and charging accessories are not obviously abnormal in use.You can apply for a free replacement or Refund full amount or contact us through order detail page if it happens.