Main feature:
1. 4CH HDD DVR with dual SD card for safe storing
2. Optional built in 3G/Wi-Fi
3. Unique design with anti-vibration and heat dispersion
4. Video resolution D1/HD1/CIF optional
5. Supports remote control and mouse (USB 2.0, USB 1.1)
6. Networking protocol: TCP/IP, FTP, SMTP, RTP, DHCP, DDNS
7. Supports RS485 tilt control
8. 4 triggers and Linux system
9. Warning: supports 7CH high level alarm input, compatible 4CH dry contact alarm input
10. 4CH high level alarm output