Up to 300 MB/s for 256/128GB models; Up to 200 MB/s for 64/32GB models. Up to 72 hrs in seawater Up to 1,500 gravitational acceleration. Withstands -25°C to 85°C operating, -40°C to 85°C non-operating Up to 15,000 gauss (equal to MRI). Up to 50 Roentgen (equal to airport X-ray machines). Note: Actual speed may vary depending on the conditions of the host device (card reader, adapter, USB port, etc.) the writing speed will be slightly lower.