What do the LEDs on the switches and controllers mean?

Switch LED Indicator

When the switch is paired with at least one controller, its LED indicator flashes when the switch is pressed. The flashing LED indicates that the switch has successfully communicated with its controllers.

The light will also flash when the 10 years + life expectancy of the battery reaches 20%. At this point, the switch's CR2032 coin-cell battery will need to be replaced within four to six months.