Fangrui Product Details 1. A Counter To Count The Quantity Of Objects In A Single Batch And The Number Of Batches, And Also Can Be Used As Length Meter. 2. Can Be Connected With Encoder, Length Counting Wheel, Proximity Switch, Photoelectric Switch, Optical Sensor, Capacitive Switch, Etc. 3. Npn And Pnp Sensor Input Switchable. 4 Kinds Of Input Mode, 6 Kinds Of Output Mode. 4. Can Set Alarm Value For Relay Output. Dual 4 Digits Led Display. 5. Widely Applied In Chemical, Machine, Light Industry, Etc. Brand: Mypin Model: Fh4-4crnb Application Range: Machine, Light Industry, Electronic, Food, Package, Leather, Cloth Weaving Industry. Function: Counting, Measuring Length, Automatic Control Alarm, Automatic Loop Alarm, Etc. Input: Pulse Signal: Square Wave And Sine Wave: 5less Than Equal Hless Than Equal 30v 0less Than Equal Lless Than Equal 2v Up Edge Active Input Impedance: Greater Than Equal 10kohm Counting Speed: 30/5000cps Counting Range: -1999-9999 Preset Range: 0.001-9999 Accuracy: +/-0.f.s Output: 1 Relay Contact Output