Patent ID: 7353042

Claim:
A wireless call system comprising: an outdoor unit installed on the outside of an entrance of a structure having a door lockable with lock means, the outdoor unit having a call button responsive to finger pressure and means responsive to the call button to make a call to a resident in the structure and a message input button, responsive to finger pressure, controlling a messaging means for inputting a message to the resident; an indoor unit connected to the outdoor unit by radio, for informing a resident of presence of a visitor upon receiving a signal from the outdoor unit and allowing the resident to answer the visitor through the outdoor unit; the outdoor unit having image pickup means for picking up an image of the visitor making a call with the outdoor unit; the indoor unit being handheld configured to be held in hand and portable and having display means incorporated therein for displaying the visitor's image picked up by the image pickup means and unlock means for unlocking the lock means, the indoor unit being portable to an optional location and allowing, at the optional location, the resident to check the visitor displayed on the display means and, if necessary, unlock the lock means through the unlock means, the outdoor unit having fingerprint input means for inputting fingerprint information of the visitor, unlock control means for unlocking the lock means if the fingerprint information input through the fingerprint input means agrees with registered fingerprint information, the call button having a call button body formed of conductive material and grounded to effect static discharge in conjunction with finger depression to form an integrated static discharge and input button device, wherein the conductive material is any one of nonconductive resin mixed with conductive metal powder, nonconductive resin mixed with carbon fiber, and conductive resin, the outdoor unit having a housing including a front wall defining a call button aperture, and a base panel within said housing and opposing a front wall inner surface of the front wall, said base panel being a circuit board carrying contacts, the call button body being disposed in the call button aperture and having at least a portion thereof disposed between the front wall inner surface and the base panel, the body extending from the front wall inner surface toward the base panel and having a flange portion engageable with said front wall inner surface and a movable contact opposing said base panel, a spring interposed between the flange portion of the call button body and the base panel to bias the call button toward the front wall of the housing, the base panel having a panel front surface with a fixed contact disposed thereon opposite to the movable contact and a grounded conductive part also formed on the panel front surface, and the call button body being electrical connected by a connection line to the grounded conductive part.