CRM-8104D comes with 4-channel D1 resolution, bi-directional audio capabilities. Its multi-level anti-vibration technology ensures the reliability in tough environments and dual streaming technology enhances the network transmission efficiency with the limited bandwidth. The product supports extended alarm system, GPS for vehicle management, and various choices for back-up: network, local HDD, USB, and CF card. It has optional media player function for MPEG-2, MPEG-4, and DIVX formats. CRM-8104D has aluminum alloy housing design with anti-splash and damp-proof protection for vehicular surveillance.