OKIOCAM does not have a power button to turn on the camera. It will power up automatically when you start any app that requires camera access. OKIOCAM uses the default webcam driver with your operating system, which functions exactly like a built-in front-facing webcam on a laptop. If your chosen app can work with a built-in webcam, then it will also work with OKIOCAM. Select OKIOCAM in the video input settings menu of your desired app, and a white LED on top of the camera will light up, indicating that it is powered up and functioning.