This product is either discontinued or we cannot get that from suppliers.
Dahua DHI-VTK-VTO2000A-2-VTH1550CHW-2 (S) Dhi-vtk-vto2000a-2-vth1550chw-2 2 Wire Ip Interccom Kit, Sensor: 1/3Inch 1.3MP CMOS, Lens: 2.8mm, Angle of View: D:120, H:90Degree, Audio Input Omnidirectional Mic, Audio Output Built-in Speaker, Ethernet: 10M/100Mbps Self-adaptive, Power: DC 24V or supply directly by VTNC3000A.
Dahua Dhi-vtk-vto2000a-2-vth1550chw-2 2 Wire Ip Interccom Kit (DHI-VTK-VTO2000A-2-VTH1550CHW-2 (S).