Product Description About capacity: 512GB=approximately 478GB-492GB 1024GB=approximately 936GB-970GB This is calculation difference between manufacturer and our PC please Google Memory card capacity to get more information. Protection： Waterproof Temperature Proof Shock Proof X-ray Radiation Proof Package Include: 1* 512GB Micro SD Card And a SD Card Adapter 1* 1024GB Micro SD Card And a SD Card Adapter Warm Tips: 1.The goods can cover the difference within 30 days.Our Store offers 100% genuine memory card with 1 year warranty 2.Please use quaity card reader to verify all memory card on PC。 3.Please don t use cheap card reader to test memory card speed of memory card will be reduced by low quality card reader. 4.Memory card speed is greatly affected by card reader adapter USB port etc. Low quality device will 100% slow down card speed. 5.If you have any questions or dissatisfaction with the product please contact us directly through Amazon we will definitely give you a satisfactory answer! Thank you for visiting!