The Simple 4 is uniformly illuminated - Two settings are available - adjustment - lighting will come on when you unlock the Simple 4 - or a different setting, lighting the Simple 4 goes on when key is pressed - but the Simple 4 lighting works rather randomly or remains ever, until the next keystroke.
With the Copy button commands of the device remote controls are transferred to the Simple 4 and thus missing device commands can be trained, mixed storage of commands at the same level of Simple 4 from different devices is also possible, but it happens, the commands must be taught more often, before the Simple 4 accepted the learned commands.
The device is habituation thing, a brief illustrated guide is available, two AAA batteries, the buyer must buy it.