The series electronics run through batteries fairly quickly, so most players always use the power supply. And on this particular bass, a small body, by eliminating the 1/4 jack, it was possible to move the pickup selector switch from the lower horn, where many folks find it a bit in the way, to the 1/4 jack's location, which for some folks is a very good location for the switch, out of the way. I think it's a nice layout. Also, eliminating the batteries, brass cover, and jack does reduce the weight a little bit. And the appearance on both the top and back looks cleaner.