Camera sensors and screens in houses and yards.
דבר דבר (Dabair Davar): Addition 2 to 1538: Requests in Davening on Shabbos;
Different types of examples of squeezing out liquids that were absorbed in various types of foods.
Is One Allowed to Move Traps on Shabbos (e.g., Mouse Traps, Roach Motels, Flypaper)?;