It does exactly what it's supposed to. Hooking it up is easy but save and look at the connection diagram on the website as nothing comes with the kit. I just installed 2 on my boat to check the voltage status on both sides of the house and the state of charge of my solar panel which powers both batteries. The product seems a little cheaply made, but time will tell. The green LED is clearly visible day and night. I installed a momentary switch on each so the LEDs don't stay on all the time. It's easy to do.
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