The Dahua's analog HD Eyeball camera HAC-HDW1200EM-A-0280B has a built-in fixed lens of 2.8mm and provides superior 4MP video. HDCVI technology supports 4 signals to be transmitted over 1 coaxial cable simultaneously, i.e. video, audio*, data and power. Dual-way data transmission allows the HDCVI camera to interact with the HCVR, such as sending control signal or triggering alarm. Moreover, HDCVI technology supports PoC for construction flexibility.