So you can describe the function in about. Every now and then it works sometimes, but why me remains a mystery. various sizes of beams, angle of the device and brightness adjustment attempts on the screen. Is now my third device and none worked properly at various screens, there were always problems. Total waste in my eyes. Unfortunately it is the only online banking offering my bank so I can not change too .... If only the wait for something that works and in 2014 !!!