Editorial standards
Official UK guidance and exact manufacturer documents remain the basis of attributed facts. Original diagrams explain editorial decisions or explicitly hypothetical calculations. Archival photographs identify physical forms, not current recommendations or a compliant installation.
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Topic image credits
Archival equipment photographs identify physical forms. They are not current purchase recommendations or our own product tests. Proportional WebP resize, no crop.
- doorbell: Ring · Wikimedia Commons original · CC BY-SA 4.0
- lock: Nuki Smart Lock · Wikimedia Commons original · CC BY 2.0
- contact: Yakowljew · Wikimedia Commons original · CC BY-SA 4.0
- motion: Geom · Wikimedia Commons original · CC BY-SA 4.0
- battery: Lead holder; gamma correction by Wdwd · Wikimedia Commons original · CC BY-SA 3.0
- reader: Tony Webster · Wikimedia Commons original · CC BY 2.0
- camera: Wikideas1 · Wikimedia Commons original · CC0 1.0
- router: Suyash Dwivedi · Wikimedia Commons original · CC BY-SA 4.0
