Adopting embedded Linux operating system, Hikvision DS-MP3504-SD series mobile video recorder provides powerful monitoring functionalities, including audio and video encoding & decoding, secure data storage. It can both work alone as a recorder and cooperate with other devices to build a comprehensive surveillance system. Owing to the features of high stability, small in size and low power consumption, DS-MP3504-SD is widely applied to the surveillance projects of truck, taxi, etc.