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Check battery status at a glance! You can build this kit to monitor 5 8 or 12V DC power supplies (optional parts supplied) and you can set the LEDs to indicate .25 .5 or 1V steps. SIZE: 1.3 x 2.7. Current usage depends on the voltage and the number of LEDs lit (typical 80mA at 12V) but you can easily add a pushbutton switch on the input push and check!