This is the mobile app for the BTS Official Light Stick Ver.4. The Light Stick is connected to a variety of features. [Key Features] 1. Connect Light Stick You can connect to the Official Light Stick using Bluetooth. With the Light Stick turned off, press and hold the buttons on the Light Stick handle simultaneously for 2 seconds to enter Bluetooth Mode. (The Light Stick will blink blue.) Turn on Bluetooth on your phone and connect to the Light Stick. 2. Concert Mode You can check information about upcoming concerts and whether pairing is required. Enjoy a variety of Light Stick patterns linked to the stage during concerts. 3. Light Stick Update You can update your Official Light Stick to the latest version. [Precautions When Attending a Concert] - For concerts that do not require pairing, the Light Stick will automatically light up if you turn it on before the concert begins. - For concerts that require pairing, refer to the separate concert guide, register the concert information in the app's [Concert Mode] menu, and then pair with the Light Stick. - Always keep your Light Stick firmware up to date. If an update is required, a separate announcement will be made via official channels. - On-site congestion on the day of the concert may delay the firmware update and pairing speed or cause them to fail. Please complete the firmware update and pairing before coming to the concert venue. - Replace old batteries with new alkaline batteries before using your Light Stick. (three AAA batteries) - Using old batteries without replacing them with new ones may cause the Light Stick to fade, or flash in different colors then go off during the concert. Please prepare extra batteries. - The Light Stick will remain paired during the concert even if the batteries are replaced, and the light effect will continue automatically. [App Access Permissions] The following are required for the app to run smoothly. Select [Allow] when permissions are requested. - Bluetooth : Required to connect and control the Light Stick. - Location : Used as a reference to provide app services, data will not be stored. - Photo : Required to save and load a code image. - Storage : Required to store data necessary for app usage. You can change permissions in [Settings] > [Apps] or [Applications].