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Reviews around ring (5.00 of 5)
Palumma Car Charger, 5V/3.6A Dual USB Port Safe Smart Quick Car Charger Adapter with LED/LCD Display Battery Low Voltage Warning Volt Meter Car Battery Monitor (Black)
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When nothing is plugged in, the ring glows green
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Digital readout and LED glow ring let you know the charge state (voltage) of your car battery or when charging any portable device the charge level (in amps) going into it's battery
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The outer ring glows green when plugged in and when a USB device is charging it glows a faint white
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