Device Activation is a free Android app developed by Yokogawa Electric Corporation. It is a business and productivity category app that allows users to activate and deactivate devices such as Sensors and Gateways. The app functions include opening the app, logging in, selecting the group, scanning the QR code printed on the device, and choosing the option to activate or deactivate the device based on the device's status.

At the first time of device activation, the user can only use this app. Once the user clicks on the activate device option, the device status will change from Registered to Activating, and once the device is activated, the status will change to Activated. However, if the device is not activated, the user can force deactivate the device before activating it again.

The app has a floating menu in the top right corner that allows users to reload and check the device status. The app also logs out automatically every one hour. It is important to note that the app does not support NFC in this version, only QR code scanning. By installing the app, users agree to 'Device Activation App Software License Agreement' as stated on their website.