Packaging and instructions. Brand product attaches great importance to customer satisfaction, product packaging and manual of Kung Fu is not qualified as compared to brand products, imported brand must be equipped with a user manual. For product name, brand, technical indicators marked very clearly, from installation to security considerations are also readily available. These are select socket you need to be aware of. On the ground. Better to buy three plugs, plug two legitimate manufacturers are not producing. Strip ground wire jacks and sometimes not so unsafe.