Specifications Model No. - PB-30SU Detection system - B reak ing of infrared beam Protection distance - 100ft. Max. Beam range - 490ft. Response time -50 msec. to 100 msec. Supply voltage - 10VDC to 30VDC (non-polar ity)Power consumption - T ransmitter : 7mA or less at 12VDC 12mA or les..