... cameras and support 4ch playback simultaneously ;&, Support U disk, USB mobile HDD, USB DVD-RW . network storage and backup;&, 4ch network ... input and 1ch alarm output;&, Support 3G, WIFI;&, Support 2 SATA ports;&, Support 3G smart phone surveillance(Iphone, blackberry, windows mobiles, android ... &, NO MOQ for Sample Order; &, Certifications: ISO / CE / FCC / ROHS. 3G WIFI NVR system for ip camera