Measuring Air flow and air velocity Jumbo Indicator, Range -1999 to 9999 and resolution Configurable , 110230 VAC mains power operated. Wall mountable , alarm optional. Retransmission Out put : 4-20 mA optional Input from transmitter : 04-20mA, 0-10 VDC LED size available : 1�,2�, 4�, 6� ( 4 digit) Process offset : -999 to 999 selectable Available transmitter supply : 12 24 VDC Retransmission out put : 4 -20mA optional