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[Wide Compatibility] Suitable for DC 12/24V cars, boats, ships, motorcycles, ATVs, RVs, golf carts, SUVs, etc. This car USB charger is compatible with electronic devices such as iPhones, iPads, Samsung, Android cell phones and tablets, smartwatches, etc.
Easy installation: You can replace your car's original cigarette lighter socket with this USB charger. Or, you can DIY the installation by drilling a 1.18 inch/3cm hole, inserting the charger and tightening the ring, then connecting the positive and negative wires(Red wire to Silver plug(+), Black wire to Golden plug(-) ). See the pictures for detailed installation instructions.
Please note: The bottom of the product is marked with "+" and "-", the red line connects to +, the black line connects to -; if the connection is reversed, it will not be energized.