Pentax K-AC7U AC Adapter Kit for Optio MX Digital Cameras
From Pentax

Pentax has been a leader in the photographic field for many years. Many Pentax innovations have become standards in the industry. Pentax's enthusiasm and devotion towards the development of high-quality products have thrived over the years and continues to be stronger than ever.

Brand: Pentax
Model: K-AC7U
Dimensions: 2.00" h x 4.60" w x 8.00" l, .65 pounds

Flawed design? or, a marketing ploy by Pentax motivated by profit?
Too much money paid for a product that could have been an integral part of the battery charger that came along with the camera. It should have been designed by Pentax just like the AC Adapter that comes along with a standard video camera. I'm not sure if it was a flawed design, or, a marketing ploy by Pentax motivated by profit. I tend to believe it was the latter.