Digit Counter, DC 8-24V 4 Digit LED Digital Display 0-9999 Up/Down Plus/Minus Panel Counter Meter with Cable (Green)

I bought the red led unit and like others have said, the digit was very dim.No instructions so you have to go to the listing on Amazon to get the diagram.Would not count up or down.I used a lab variable supply and ta around eight volts the display came on.At 11 volts the display was at it's brightest. (No way you would be able to see it outside).After about 11.5 volts the display began to get dimmer and at 31.1 it went out.Tried it several times with the same results.After about a minute and a half it began to smell hot then quit.Ordered a replacement, because I already had the hole cut in the panel, and will let all know how it goes.

Counter works well all be it a little dim , but my main criticism is the lack of real instructions or even a simple data sheet on what pin does what. These days I dont expect a printed manual or whatever, but an online link is almost mandatory. Worked it out with time and intelligent guess work, but should not have to. Lost a star due to that.

1 = (+) Positive (8-24volts From power supply)2 = (-) Negative (from Power supply)3 = (ground signal) this would go to one end of momentary button(s), use in combination with #4, blue or black wire on other end of button(s).3+4 = reset or clear3+ blue = count up3+ black =count downI am unclear on what # 5 is used for. perhaps some sort heart rate monitor? ha haGeneral advice: Use care when wiring and leave unpowered until all connections are made to prevent shorting systemHopes this helps

Non-functional right out of the box. One of the digits comes on initially, and slowly dims out completly. Other digits never come on at all. It does not count or respond to any inputs.

When I got this counter my first instinct was to turn it on and try to get it to increment, I powered the module with my bench supply and connected the blue wire to 12v to get it to increment and immediately fried it :(The correct way to send signals is to connect the signal wires (4, blue and black) to the signal ground (3). The signal ground pulls the signal wires low making the module count. I may be dumb or just overlooked that detail but I wish this was explained clearer a part of the product description or with the packaging. Woulda saved me $15.

I am using these units with a dry contact to trigger the counter. Unfortunately it does not always count one impulse at a time. Sometimes it's one or two or five on a single impulse.No use for me. Will be returned.

Came with a set of wires for the counter activator, but no directions on what other connections go to which pins. Absolutely no information, directions, diagrams, nothing.

This display is hard to see in the nighttime and not visible at all in ambient daytime.