Saicoo 8A/40W 4 USB Car Charger with Extension Cable for $13.99. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for your reference. This particular car charger is convenient in that it has a built-in extension so that there is more flexibility such as charging for devices for passengers in the backseat. It has 4 USB charging ports withmax combined total power of 8A/40W output.