An input device, that includes a casing having at least an opening, a supporting base set on the casing, a base plate set within the casing, at least one pressure sensor set on the base plate, and an actuator movably set on the supporting base. The first insulating housing defines a pair of fitting spaces extending in the lengthwise direction and a pair of mounting holes extending in the lateral direction and respectively communicating with the fitting spaces, and the pair of screw caps are respectively received in the fitting spaces in the lengthwise direction. The monitoring may include detecting connection transactions initiated by the access requestor, counting the number of connection transactions initiated by the access requestor during the first configurable period of time, and comparing the number of connection transactions initiated by the access requestor during the first configurable period of time to the configurable threshold number. The method further includes assembling a first database of locations and corresponding wireless signal strength and access points.