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Popcorn Micro SD Card 128GB 64GB V30 A2 4k High Speed Durable Driving Recorder Surveillance 100MBS 1. POPCORN Micro SD card :read speed 100MB/s;write speed 40MB/s •32GB maximum read speed: 100MB/s, maximum write speed: 40MB/s (32G A1 U3 V30 UHS-I SDHC) •64GB maximum read speed: 100MB/s, maximum write speed: 40MB/s (64G A2 U3 V30 UHS-I SDXC) •128GB maximum read speed: 100MB/s, maximum write speed: 40MB/s (128G A2 U3 V30 UHS-I SDXC) 2. POPCORN The 32GB Micro SD memory card has A1 performance and supports UHS-I, U3, and Video Speed Class 30 (V30); The 64GB Micro SD memory card has A2 performance and supports UHS-I, U3, and Video Speed Class 30 (V30); The 128GB Micro SD memory card has A2 performance and supports UHS-I, U3, and Video Speed Class 30 (V30). 3. IPX7 Waterproof, Shockproof, with extreme temperature resistance [-20°~70 °C], X-ray radiation resistance, and magnetic resistance. stable and sturdy! 4. Compatible with multiple devices: The POPCORN SD card is compatible with most surveillance cameras, smartphones, tablets, drones, sports cameras, cameras, and other Android devices on the market. Compatible with various surveillance camera models(V380/TP/Xiaomi,yada yada yada) 5. Select a memory card based on the number of days of storage. With a monitoring screen resolution of 1080p, the storage time of a 32GB memory card is about 10 days; The storage time of a 64G memory card is about 20 days; The storage time of a 128G memory card is approximately 60 days. (Note: The above are test data for reference only.)