Check that Bluetooth is available and turned on for your phone or tablet. It will not detect the light bar and allow it to connect to the app if Bluetooth is not activated. Restart your device if necessary. Be sure to have the app installed and fully set up on your device. Only try to connect the light bar to the app in an open area with strong Wi-Fi connectivity. Make sure the light bar is already plugged into a compatible USB power source before attempting to connect it to the tzumiLED app. It will not be recognized via the app if it is not securely plugged into a power source beforehand.