The S400 remote display is clearly readable in pouring rain, bright sun, pitch dark, inside or out, without additional lighting or shielding. The SA2000 is for indoor use only. They will interface with any digital indicator, terminal, or computer with standard output. The display features light emitting diodes (LED's) which can withstand temperatures ranging from -50 deg F to 120 deg F. The 2" display has 8 digits 5x7 dot matrix alphanumeric LED. The 4.5" display has 6 digits, 7 segments each, max 999,999. Decimal point is selectable. One or two fixed zeros. RS232 or 20ma current loop active or passive. Baud rates 50 to 9600. Power required is 9 to 12 VAC or VDC at 3 amps provided by power supply (included) UL listed, plug in wall transformer, 120VAC, 60Hz, 1 amp with 6 ft 3 cond cable to display. Easily extended in the field. S400 & S400HI is NEMA 4X moisture tight 32.5"W x 3.5"D x 11.5"H. SA2000 is NEMA 1 for indoor use, 16"W x 4"D x 5"H. Power supply wall transformer 2"x 2"x 3".