SD card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will 100% slow down card speed. SD Card format,High-speed read and write. The SD card speed is based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.
eBay
Low quality device will 100% slow down card speed,1MB=1000KB.
eBay
eBay
256GB MicroSDXC Card - Class 10, V30. Ensure that your data storage is as resilient and versatile as your lifestyle with this top-tier MicroSDXC Card. Comprehensive Compatibility: Suitable for various devices that support MicroSDXC Cards.
eBay
Samsung PRO Endurance 256GB microSDXC UHS-I U3 100MB/s Video Monitoring Memory C
eBay
Available in Multiple Capacities: Choose from 16GB, 32GB, 64GB, 128GB, and 256GB based on your storage needs. Storage CapacitiesAvailable in 16GB, 32GB, 64GB, 128GB, 256GB. File SystemFAT32 (for 8GB & 16GB) / exFAT (for 32GB, 64GB, 128GB, 256GB).
eBay
Available in Multiple Capacities: Choose from 16GB, 32GB, 64GB, 128GB, and 256GB based on your storage needs. Storage CapacitiesAvailable in 16GB, 32GB, 64GB, 128GB, 256GB. File SystemFAT32 (for 8GB & 16GB) / exFAT (for 32GB, 64GB, 128GB, 256GB).
eBay
4.64GB 128GB 256GB Storage Size. Micro TF Mini SD Card. 1 x SD Adapter. Storage Temperature -40º F to 185º F (-40º C to 85º C).
eBay