Product description:
Attention 1. The product does not include an adapter and recommended use with the adapter of 12V/2A, 9V/2.7A or above, if use a computer's USB port or 5V/1A power supply, the product might not charge or charge slower.
2. The phone case thickness4mm, and there no metal between your phone with wireless charging pad.
Specifications:
... Black/WhiteInput: 5V 2A, 9V 2A
Mobile Phone Wireless Charging Power:15W , 10W