Device and method for determining a status of a person

Embodiments relate to a device (102) for mounting on a wall for monitoring an environment (100). In one embodiment the device comprises: a body comprising: an active reflected wave detector (206); and a processor (202) coupled to the active reflected wave detector, the processor configured to: control the active reflected wave detector to measure wave reflections from the environment to accrue measured wave reflection data, and identify a status of a person (106) in the environment based on the measured wave reflection data, wherein the processor assumes, for said identification, that the active reflected wave detector is at an operating height above a floor of the environment. The device comprises a cord (108) extending from the body, the cord having a length for ending at the floor when the device is mounted with the active reflected wave detector at said operating height and the cord is freely hanging and straight.