... (GS-8A13) 420/480/520 TVL selectableFeatures:* Highly reliable professional DSP solution, super powerful RTOS, realize industrial level ... and multi-level password authorization management * Built-in Web Sever to realize remote surveillance, control and setting via ... , DDNS, NTP, Email, IP authority, IP search, web alarm center), (WEB, client viewer)Technical Specification:Image Sensor 42S/42SN 420 ...