Features:Instant touch feedback on contact.Sleek & compact to save the space in any electronics instruments.Also Available in Standard 4x1 to 6x6 matrix keyboard option.Insert option for user legend insertion. Common Features:Pcb : Glass Epoxy PCB FR4 Grade in thickness ranging from 0.4 mm to 3.2 mm ( Tin & Gold Plating ).Overlays: Polycarbonate - Lexan; Polyester AutotexConnector: Berg strips, Relimate etc.Adhesives: Industrial Grade from 3M, Avery Dennision. Specification:Key type : SPST normally open.Key Life : 1-3 Million.Operating current & voltage : 20mA 24V.Operating Temperature : -10 to 70 deg centigrade. Application :For proto type development of instrument.For engineering student in projects.