"We recommend you leave the sensor undisturbed, in the
closed or non-alarm condition, for 5 minutes before testing
it. Waiting guarantees accurate test results because the sensor
has enough time to turn off its built-in power-saver feature,
which automatically turns on when it is tripped more
than once in a 4 1/4 minute time period.
When the power-saver feature is on, the sensor transmits
only half the usual number of data rounds when tripped. For
example, during a dealer sensor test you normally expect to
hear up to 8 data rounds. When the power-saver feature is
on, you may hear only up to 4 data rounds."