The smartphone gets very hot very fast, causing the charging to stop prematurely (after charging only 15-20%),and the stated capacity seems inaccurate. It's hard to document this with measurements or video, so a dispute wasn't started. Basically, wireless charging is bad in my opinion; the convenience isn't worth the battery life, speed, and reliability of charging. This device doesn't charge via wire either, so I put it away with other unused items. A regular power bank is a better choice.