... Entry System, Video Intercom, Multi-user Intercom, Video Intercom for multi-stories Building, Video Door Phone Intercom, Digital Intercom ... Intercom, Building Intercom System, Building Video Intercom, Video Intercom for Apartment and Building, Digital Security Intercom, Video Intercom ... :1.4-inch CRT. 2.Power consumption: working, max 9W, holding, 130mW.3.Environmental temperature:-30°C-55 ...