4ch hdd car dvr 1. Built-in gps module. 2. 3g transmission function (wcdma/evdo) 3. 4 channel video and audio recording (1 / 2 ch optional) 4. Advanced h.264 high profile technology for video compression at lower bitrate. 5. Video format: 1 d1 (25fps) + 3 cif(25fps) 6. 4 alarm input, 1 alarm output 7. Motion detection / timer switch / alarm recording 8. Dual shockproof 9. Strong multiple medium supported car black box 10. Data storage: max support 2tb sata hdd, support 64gb sd card 11. Compact size & lightweight, much easier for installation 12. Body weight: 1.1 kg. 13. Product size: 148 mm x 122mm x 55mm 14. Language: english / chinese Can talk with car drive via computer in office.Easily communication. Package size:187*166*150mm, 2.5kg