As motion and presence sensors have become relevant in recent years, the benefits of the convenience and energy savings they bring have never been greater. Motion or presence sensors are very handy smart devices. They can cause all kinds of behavior: from turning on lights, unlocking doors to turning on devices and much more. But how do you decide between a motion sensor and a presence sensor? To answer this question, you need to understand the differences between the two types of sensors. The motion and presence sensors are activated by measuring the movement in a certain area, and the main difference lies in their sensitivity. When a motion sensor relies on significant motion to elicit action - ie. someone who enters a room or corridor - presence sensor, can register finer actions, e.g. people sitting at their desks, working on a computer or making phone calls. Presence, or as they are sometimes called, residential sensors use higher-resolution components that are more accurate. Motion sensors are usually available at a lower cost. The motion sensor is ideal for detecting significant movements while walking, while the presence sensor detects finer actions and will identify if you are still in the room. Both motion sensors and presence sensors can measure the intensity of ambient light, so they will only be activated when certain preset lighting thresholds are reached.