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Safe-up joined with strong point of warning triangle and light baton. It is moves, and visibility is high. And you can put a long time. Metronome moves by weight of a weight. It can move without electricity. Safe-up uses weight of a weight, and shake light baton. Safe-up does not require electricity like metronome.
JoChiWon, South Korea
DaeGu, South Korea
Bang, Yune Je