Detailed Product Description Part NoB.P.F Center Frequency(KHz)Supply Voltage Typ(V)Supply Current Min(mA)Transmission Distance Typ(m)Angle 2O 1/2 M791-H1385315±45M75138535±45M551385315±45M781385315±45M391-H385315±45 The annual output for LED, dot matrix, digital, the clock-Series are about ten billion. In recent years, it invests about ten millions to build automatic production lines. With the ...