The Dahua's analog HD bullet camera HAC-HFW1500TL-A has a built-in fixed lens of 3.6mm and provides 5MP 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 XVR, such as sending control signal or triggering alarm. Moreover, HDCVI technology supports PoC for construction flexibility.