| 1. Product range | Indoor monitors, outdoor door stations, and available system configurations. | Current product catalogue, model numbers, and installation manuals. | A suitable range makes it easier to match the equipment to the property and project size. |
| 2. Video and display specifications | Camera resolution, viewing angle, screen size, and performance in low light. | Model-specific datasheets and sample footage or a product demonstration. | Clear images and a usable display help residents identify visitors. |
| 3. Wiring and system architecture | Wiring requirements, power supply, maximum supported devices, and installation constraints. | Wiring diagrams, installation guide, and written confirmation of system limits. | The system must suit the building’s existing wiring or planned installation. |
| 4. Door access features | Door-release control, supported lock types, and any access methods included in the system. | Connection diagrams and compatibility details for the intended electric lock or access device. | Correctly matched access components are essential for safe, reliable door operation. |
| 5. Compatibility and integration | Compatibility among indoor monitors, outdoor stations, and any required accessories. | A model-by-model compatibility list and written confirmation for the proposed configuration. | Products that look similar are not necessarily interchangeable across system generations. |
| 6. Outdoor durability and compliance | Published environmental ratings, operating conditions, and applicable electrical or safety approvals. | Product-specific test reports, certificates, and installation requirements. | Verified ratings help determine whether equipment is appropriate for its intended location. |
| 7. Supply, warranty, and support | Warranty terms, spare-parts availability, technical support, and expected order lead times. | Written warranty policy, support process, parts list, and a dated quotation. | Clear after-sales arrangements reduce procurement risk and help with future maintenance. |