On the last models of Samsung was easy! Just press the volume key and the flashlight is turning on! (of course you should first to approve this in settings:) When you want to stop it just press the volume down! I have Xcover 1 and 2, I used it a lot, it is easy and good option but sometimes the flashlight was turned on in my pocket of my carhartt jeans and the battery finished very quick. So in settings you can make the flashlight to work only 1-2min. and to stop automatically. I bought S5 Active few days ago and I am very angry that the phone has no same option!!! I see one decision but. To upload a Torch APP and then to switch on this APP with functional extra key, which is over the volume key.