Abstract: The present disclosure relates to a holder for a tablet electronic device that comprises: a base member having a slot formed on the base member; and a main clamp including a stand mounted to the base member and extending upwardly and an arm arranged at one end of the stand and extending substantially perpendicularly from the stand. The arm comprises at least one flexible fastener protruding from a bottom of the arm. Further, a position of the at least one flexible fastener corresponds to a position of the slot.

Abstract: A signal connector with elastic clamping plates and to-be-pressed-against posts for ensuring secure connection and watertightness includes a connector socket and a connector plug. The connector socket has a base insulating body provided with: plural base connection terminals, two to-be-pressed-against posts, and a longitudinal conical portion and plural transverse conical portions for dividing the base connection terminals into rows. The connector plug has a head insulating body provided with: plural head connection terminals, two elastic clamping plates, and a longitudinal insertion groove for accommodating the exposed head connection terminals and, when the connector socket and plug are connected, for accommodating the longitudinal and transverse conical portions, too.