... DC Mobile DVR, 4-channel Real Time Full D1, HD1 recording, Support GPS, 3G, Embedded Linux Systems Specifications:Operating language: Chinese ... 2.2V Distortion plus noise: ≤ -30dBRecording mode: sound and image synchronization Support GPS, embedded Linux system, 8 to 48V DCAudio ... compression: ADPCM Image format: 4 x CIF (352 x 288) or 4 x ...