BeMyGuest OFFICIAL LIGHT STICK is an app designed for using the official penlight of Be My Guest. The app allows users to connect their smartphones to the OFFICIAL LIGHT STICK via Bluetooth and control the light effects to match live concerts. Users can select the live event from the concert list, input seat information, and enjoy a variety of light effects synchronized with the performance.

By holding down the penlight button for 3 seconds, users can switch to "Bluetooth mode" for seamless connection with their smartphones. Additionally, the app offers a self-mode where users can choose the desired color for the penlight directly from their smartphone screen.

Before attending a concert, users can check the battery level of the penlight by tapping the "Check Battery Status" button in self-mode. It is recommended to replace the battery if the capacity is low to ensure uninterrupted performance during the concert.