The Dahua's analog HD bullet camera HAC-HFW1801R-Z-IRE6 has a built-in motorized varifocal lens 2.7 - 13.5 mm and offers 4K video surveillance. 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 technol-ogy supports PoC for construction flexibility.