The display does not light up by itself and is hard to read even in daylight, if it is not illuminated by pressing a button. However, this has the advantage that you will not be disturbed at night by a proper light the appliance. The operation is intuitive and exemplary good, which unfortunately is not always the case for alarm.
CONCLUSION: A good, simple, beautiful alarm clock for those who are easily and quickly woken. Heavy sleeper and hard weckbare nightcaps need but a "more common" alarm clock!