Features: Dual 6 digits LED Display for clear reading. NPN and PNP sensor input is switchable. Includes 4 kinds of input mode, 6 kinds of output mode for option. Input and output is optional isolated. Counting Range: -199999~999999; Preset Range: 0.00001-999999. Can set alarm value for relay output. Can be connected with encoder, length counting wheel, proximity switch, photoelectric switch, optical sensor, laser-sensor, etc. Widely applied in chemical, machine, light industry, etc. Specifications: Model: FH8-6CRRB Material: ABS Color: black Power Supply: 90~265V Auxiliary Power: 24V DC Input: Pulse Signal: Square Wave and Sine Wave: 5V≤H≤30V 0≤L≤2V up edge active Input Impedance: ≥10KΩ Counting Speed: 30/5000CPS Response speed: switch type input 0~5000hz, incremental encoder input 0~2000hz Output: 2 Relay Contact Output Environment Temperature: 0~50℃ Storage Temperature: -10~60℃ Environment Humidity: 35~85%RH Insulation Resistance: ≥10MΩ Power Consumption: ≤5W Package Contents: 4 x Counter 4 x User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.