RhombusEM501 series and RhombusEM502 series readers, specially designed for access user, is a kind of reader with 3x4 keypad. It is wiegand output format and has many colors for user’s choice.
　　 Keeping high stability, high consistency and high sensibility, RhombusEM501 series and RhombusEM502 series readers are also designed to strengthen the reader’s protection because of wrong connection of power supply or data line.

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