4 Digit Seven Segment LED Display. Wide Range 0 – 9999 RPM. 3 to 30V DC Input Pulse from any type Sensor. Allows Maximum 3.5 kHz Input Pulse Speed. 12 V DC Sensor Supply. Universal Supply Voltage 90 to 270V AC / DC ,RP 430 , RP 470. Conveyors speed monitoring Motor Speed Monitoring. All types of Speed Monitoring.