MLC NAND flash for extended endurance, excellent performance, and reliability. Compatible with all VIOFO dash cams, GitUp action cameras, and other cameras. Suitable for harsh conditions, waterproof, anti-X-ray, and anti-magnetic. Transfer speeds of up to 95MB/s. Support Ultra HD 4K and 3D/VR. Only A139 Pro 4K/A129 Pro 4K/A229 Duo/A119 Mini are tested ok with Viofo 512GB Card.