About capacity: 128GB=approximately 116GB-120GB 256GB=approximately 228GB-236GB 512GB=approximately 478GB-492GB 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* 128GB Micro SD Card And a SD Card Adapter or 1* 256GB Micro SD Card And a SD Card Adapter or 1* 512GB Micro SD Card And a SD Card Adapter Warm Tips: 1.Our Store offers 100% genuine memory card with 1 years 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！