6-digit display counters electrical contacts without voltage input comes Display: LCD Reset: reset the panel or the terminal Signal input: contact or voltage Minimum count signal: H7EC-6 (8)-50ms (10 times / sec) Color: as shown Material: Plastic Power Supply: Internal Power Count: 0 -999999 / 99999999 Ambient temperature: minus 10 degrees to 40 degrees C (but not freezing state) Operating humidity: 35-85% RH Size: 4.8cm(1.89in) x 4.5cm(1.77in) x 2.4cm(0.94in) Features: Internal self-powered, no external Panel on the left with a lock to prevent misuse You can enter contact signal or signals count is accurate and reliable Maximum count rate of 60 seconds / second, 200 times / sec No mechanical wear, long life alternative to electromagnetic countere Package Contents: 2 x Digital Electronic Counter 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.