No interface, just a background service that enables and disables your torch when your screen is on.The torch stays on when your screen is off so you dont have to keep touching your screen.Keep your torch on and use other apps.You can enable and disable the app by tapping on the app in your launcher like opening a normal app.You will get a toast (flash) notification about if your app is on or off.It even works when your screen is locked.There are many different ways to handle the torch across different devices so if it doesnt work message me and I will provide an update as soon as possible.