This is a replacement charger plug (North American outlet) for the one included in the box with your K-Series or KH-Series. It allows you to charge your K-Series or KH-Series device in a traditional electricity outlet using the USB Lead Cable (sold separately).
You will also need your USB Lead cable to connect your K-Series or KH-Series device to your charger plug. This is also available as a genuine spare part if your original one has also been misplaced.