IoTPass V2 is a lifestyle app developed by CNSLink Co.Ltd for Android devices. It is a secure IoT-based access control system that allows only registered customers to enter the apartment building. The app uses Bluetooth signals from the user's smartphone to communicate with the IOT Pass device installed in the apartment building.

To use the app, users need to grant some permissions, such as allowing the app to access their location and turning on Bluetooth. The app requires users to set the location permission to "Always Allow" and allow battery optimization.

IoTPass V2 provides a convenient and secure way for apartment residents to manage access control. For any queries related to the app, users can contact the developer via KakaoTalk channel.

Overall, IoTPass V2 is a reliable and easy-to-use app that ensures secure access control in apartment buildings.