March Networks Corporation introduces its next-generation mobile digital video recorder (MDVR), which is designed for reliable video evidence collection in first response vehicles and bus and rail public transit systems. The new family of mobile DVRs is designed to be highly reliable, very cost effective to maintain, resistant to tampering and acts of vandalism and easy to access for both live and recorded video. These harsh mobile operating environments demand systems that meet stringent industry standards for resistance to shock, vibration, electromagnetic interference and water and dust ingress. The 4121 MDVR has been tested to exceed international IP65 standards.