This product is either discontinued or we cannot get that from suppliers.
Dahua DHI-VTH1550CHW-2 7 Inch Touch Screen 2 Wire Ip Indoor Monitor, LCD Screen: 7Inch 800x480, Capacitive, Input: Touch buttons, Ethernet: 10M/100Mbps Self-adaptive, Network Protocol: TCP/IP, Power: DC 24V/ supply directly by VTNC3000A, Memory Slot: Micro SD, Max 32GB.
The DHI-VTH1550CHW-2 indoor monitor allow tenants to view and talk with visitors, record call sessions, monitor the surroundings from outdoor stations and IP cameras and remotely unlock doors.