Device for monitoring an environment

A fall detector device for mounting on a vertical wall for monitoring an environment, comprising:

• a motion sensor for detecting motion of a person within a first field of view of the motion sensor;
• an active reflective wave sensor for detecting the presence of a person within a second field of view of the active reflective wave sensor using wave reflections from the environment, the first and second fields of views at least partially overlapping one another;
• a housing for mounting on the vertical wall, wherein the housing houses both the motion sensor and the active reflected wave detector, and
• a processor coupled to the motion sensor and active reflective wave sensor for receiving output from each of the motion sensor and active reflective wave sensor,
• wherein operation of the active reflective wave sensor is dependent on a detection of motion of a person within at least a portion of the first field of view by the motion sensor, and
• wherein at least one boundary of the second field of view extends more vertically downwards than a lower boundary of the first field of view.