Dahua 4MP IP CCTV Camera Motorized Varifocal Dome PoE IR Zoom IPC-HDBW4431E-Z-S4
This is the S4 Hardware Revision—the most stable and feature-rich version of the 4431 series. Authenticity: 100% Original Dahua International Hardware (Upgrade-able Firmware). Lens: 2.7mm–13.5mm (Motorized 5x Optical Zoom).