... by electronic shock, encrypted and limits of authority, upgrading of firmware, electromagnetic interference, and so on. Capacities available16MB,32MB, 64MB, 128MB ... serviceMinimum 10 years data retentionLED lightDual LED indicates power, busy, read/writeShock resistance1000GDurabilityWater proof, sand proof, heat tolerant, car dashboardOEMBe customized ...