This Device relies on a Bluetooth connection with your smartphone to process the translation from the cloud. That translation is then played aloud through speaker. Simply set your native language and the desired language into the companion app, which works for Android and iOS devices.dependence on a data connection could be a potential hitch in dire situations. But the company is trying to make voice vocabulary available for download for offline use. The device's battery reportedly lasts for eight hours in conversation mode or for 300 hours of standby time.