... , 4-channel Real Time Full D1, HD1 recording, Support GPS, 3G, Embedded Linux Systems Specifications:Operating language: Chinese/EnglishOperating ... : ≤ -30dBRecording mode: sound and image synchronization Support GPS, embedded Linux system, 8 to 48V DCAudio compression: ADPCM ... items bearing such trademarks. 4ch mobile DVR with 3G & GPS internet. H.264 compression and Full D1 recording, Embassed ...