WL-11 is the simple wireless video intercom with 2.4-inch monitor master station, automatic recording, and night time LED illumination. No wiring ensures easy installation and operation. (Communication distance - Approx. 100 meters) https://www.aiphone.net/products/single/wl-11/ https://www.aiphone.net/products/brochure/documents/pdf/WL-11_catalog_English.pdf