Duvonn Electronic Technology Co.,Ltd. is dedicated to design, manufacture and sale of high-performance fire-resistant crashworthy data memory devices. We focus on providing intact data to be strong proof for each accident and the data support for developing techniques. The fireproof performance of our products exactly match or even exceed related standard of a flight black box as per EUROCAE standard ED-155.It could be used on trains, buses, trucks, surveillance equipment, security products, etc. wherever that has higher demand for data safety. The unique data memory's inner structure with our patent technique can protect the chip with its recorded data under extremly harsh conditions, such as 1100°C high temperature fire(15-120 minutes) / 100m underwater for 240 hours/ impact shock / static crush / penetration etc. The rugged memory device for trains made as per US DOT criteria(49 CFR Part 229)，survives 1100°C high temperature fire for 2 hours. Patents have been granted for the unique manufacturing technology in China, Japan and the US.