This category covers the sensors and devices that keep a home secure without complicated installations, motion and contact sensors, indoor cameras, wireless doorbells, and presence-simulation setups that make an empty house look occupied. We compare practical trade-offs buyers actually run into, like local versus cloud camera storage and the latency and privacy questions around wireless doorbells, and focus on no-drill options that don’t require professional installation. The goal is straightforward: help you secure your home with devices that fit a renter’s setup just as well as a homeowner’s.