... Real Time Full D1, HD1 recording, Support GPS, 3G, Embedded Linux Systems Specifications:Operating language: Chinese/EnglishOperating interface: graphical interface4-channel ... ≤ -30dBRecording mode: sound and image synchronization Support GPS, embedded Linux system, 8 to 48V DCAudio compression: ADPCM Image format: 4 ... GPS internet. H.264 compression and Full D1 recording, Embassed Linux systems