Volmate 6.6A / 33W 3-Port Rapid USB Car Charger for $10.98 after coupon code V66A8OFF. Here is a screenshot for your reference. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Each USB port has its own microchip that detects the device plugged into through USB PIN signals, which gives output at full power and full charging speed for a total 6.6A / 33W output.