Membrane Keypads ? Graphic overlay only or full switching membrane ? Metal or polydome contacts ? Tactile or non-tactile feel ? Integral SMD LEDS ? LCD windows ? ESD/RFI shielding ? Insertable legend options Rubber Keypads ? Backlighting options ? Various coatings eg epoxy, polyurethane ? Harder rubber options to give ‘plastic’ feel ? Various travel/operating force options ? Combination with tactile switches ? Wide variation of colours and designs ? Plastic key tops available