1. A counter to count the 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 , 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. : : 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: Signal: Wave and Sine Wave: 5less than equal Hless than equal 30V 0less than equal Lless than equal 2V up edge Input Impedance: greater than equal 10Kohm Counting Speed: 30/5000CPS Counting Range: -1999-9999 Preset Range: 0.001-9999 Accuracy: +/-0.1%F.S Output: 1 Relay Contact Output Supply: 90-260V AC/DC Auxiliary : 24V DC Environment Temperature: 0-50Celsius Temperature: -10-60Celsius Environment Humidity: 35-85%RH Parameter Time: 10 years Insulation Resistance: greater than equal 10Mohm Consumption: less than equal 5W Contact Edge: Up edge Hole Size: 45 x 45mm / 1.77 x 1.77inch Item Weight: 106.1g / 3.74oz Type: 4-digit Counters DIY Supplies: Electrical colour:Black Material:plastic size:48 x 48 x80mm / 1.89 x 1.89 x 3.15inch Package Contents: 1 x Counter 2 x Bracket 1 x User Manual(English) Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.