A hydraulic manipulator having an ergonomic handle and good transmission behavior. A plunger is mounted for reciprocating within the baling chamber for compressing crop into a bale, with a crank shaft arrangement being mounted for rotation with the output shaft and being coupled to the plunger by a connecting rod arrangement. The connection element is slidingly connected to both of the two conductor rails. In addition, corresponding noise-canceling headphones including a connection interface, at least one switch circuit, a switch control unit, a communication microphone, two speakers, a noise-canceling circuit and two noise-canceling microphones is also provided. Other methods, devices and systems are also disclosed. An information processing unit receives inputted information from an inputting device, for example, by a QWERTY keyboard, and generates display for displaying information on display screen.