Pulse Generator, Provides Current Sinking Square-wave Pulses with Frequency Proportional to Shaft RPM of Unit to Which It is Mounted, Pick-up Mounts with a #10-32 Screw Directly to Motor Shaft Being Monitored, 1 Pulse per Revolution, Input Voltage 4.5 to 24 VDC, Max RPM 5000, Output Cable Length 6 Ft, 3 Wire 18 AWG, Stainless Steel Ball Bearings, Operating Temp -10 to 45 Degrees F, Molded Santoprene Rubber Housing