Thank you for your question regarding Legrand ASTM2 adorne® SensaSwitch™ Single-Pole/3-Way Timer Switch.
The SensaSwith will illuminate the "time buttons" when the switch is ON, only if you have it wired in with a Neutral connection. The ON/OFF button will also illuminate when the timer is OFF if Neutral is connected.
Note from Instruction Sheet:
The LEDs will only function when the neutral wire is connected.
When the neutral wire is not connected the device will function
properly, but the locator LED and preset time button LEDs will never
1.800.223.4185 opt 3
Mon - Fri: 8am - 8pm EST
Date published: 2018-05-24