Pressing the manual occupancy override button, which is located on the left side of the sensor, serves two main functions. First, it temporarily sets the space to an occupied state. Second, it checks the wireless signal strength of the sensor. The LED on the sensor flashes 3 times to indicate a strong signal, 2 times to indicate a good signal, or 1 time to indicate a marginal signal. For sensors with an LCD display, a number of bars on the display indicates wireless signal strength (3 bars for a strong signal, 2 bars for a good signal, or 1 bar for a marginal signal).