The Stray Kids Light Stick V2 is a mobile app developed by UMK Entertainment for iPhone users. This free app falls under the Utilities & Tools category and requires Bluetooth (BLE5.x) to function.

With the Stray Kids Light Stick V2 app, users can connect their lighting stick to their iPhone using Bluetooth Low Energy (BLE). By long-pressing the button on the lighting stick and placing it near the iPhone, the app will initiate BLE pairing, and once connected, the colors on the screen and the lighting stick will synchronize.

One of the key features of this app is ticket registration. Users can register their seat number to the app, and during the concert, they will experience synchronized lighting effects based on their seat location.

Users also have control over the lighting colors and effects of their lighting stick through the app. Additionally, they can customize the OLED screen image and change the background image from a selection of Stray Kids pictures.

The app also provides a battery status feature, allowing users to check the remaining battery life of their lighting stick.

However, there are a few cautions to keep in mind. Users must register their ticket information before the concert and check their lighting stick's battery remaining. It's worth noting that the app's download time may vary depending on the user's internet connection.

Overall, the Stray Kids Light Stick V2 app offers fans a convenient way to enhance their concert experience with synchronized lighting effects and customization options for their lighting stick.