The Northern Computers' KP-10, KP-11, KP-12, and KP-13 keypads offer security without the use of a card. The users need only enter their personal numerical code to gain access.The unsurpassed ability of these keypads to tolerate virtually any environment enables them to function reliably in extreme climate conditions, yet their aesthetic design allows for installation inside any office building. The KP-10 and KP-11 keypads are constructed out of stainless steel. The KP-12 and KP13 keypads are constructed of a durable plastic.The piezo technology allows the keypads to be activated by user touch, without any moving parts or contacts that can corrode over time. An audible beep and visual indication are generated with each key pressed. The elimination of moving parts gives these keypads unquestioned dependability.The KP-10 and KP-12 keypads can also be used in conjunction with a card reader of choice to provide a higher level of security.