Velleman Digital LED Clock Soldering Practice Kit (MK151)clock with red 7 segment displays in an attractive enclosure automatic time base selection (internal or net frequency controlled 50 60Hz) Internal time base with fine tuning adjustment internal time base with fine tuning adjustment select 12h or 24h mode for the time display equipped with backup battery (3 x AA) in case of power failure Features: * Clock with red 7 segment displays in an attractive enclosure * Automatic time base selection (internal