A nail-driving device has a housing, a trigger unit, a safety unit, a connecting unit and a magazine. A modulator receives a digital signal and generates a data frame from the digital signal, where the data frame is divided into segments, where at least one grouping of the segments contains the service content. In some embodiments, the plug is not \u201clocked\u201d, in that a tension force pulling on the plug will overcome the contact force at a point before the plug or outlet is damaged, and the plug is allowed to come unplugged. The improved flange allows the connection between a toilet bowl discharge and a well placed vertical waste drainpipe. The second drive gear driven by the first drive gear can rotate synchronously, and an eccentric second drive wheel of the second drive gear drives the vertical guide set, enabling the top of latch rod to drive the swinging seat frame vertically.