I bought this for an elderly friend who has a kindle shipped without this adapter. He habitually leaves his kindle on standby and was unable to recharge the battery via the USB connection to his laptop PC. The adapter soon solved the problem. It is very expensive compared with non branded versions.
I bought this for my wife who is currently working on a 2000 piece jigsaw. She has bought several "portable" jigsaw puzzle carriers in the past which either didn't work. ie The roll-up ones. This puzzle carrier is excellent. No other puzzle board can compare for quality and fitness for purpose.