You create an
invisible sensor within
range in a location familiar to you (a place you have visited or seen before) or in an obvious location that is unfamiliar to you (such as behind a door, around a corner, or in a grove of trees). The sensor remains in place for the
duration, and it can't be
attacked or otherwise interacted with.
When you
cast the spell, you choose seeing or hearing. You can use the chosen sense through the sensor as if you were in its space. As your
action, you can switch between seeing and hearing.
A creature that can see the sensor (such as a creature benefitting from
see invisibility or
truesight) sees a luminous, intangible orb about the size of your fist.