Is the app required to dim the lights or can you also do that with the switch?

Hello Valued Lowe’s Customer, thank you for your question. The app is not required to dim the lights. You can manually adjust the dim level with the switch. To increase brightness: press and hold the top of the rocker. To decrease brightness: press and hold the bottom of the rocker. If you have any further questions, please don't hesitate to respond or give us a call between the hours of 7:00 AM – 8:00 PM Central Standard Time, Monday thru Friday at 1-800-654-8483. Thank you.