Omron Keypads Type 635506 - Omron B3SZ0004M, Omron's B3SZ0004M is a compact surface-mount technology key switch.It features a 160gf snap-action with a 2.6mm height, ideal for space-constrained designs.This switch is suitable for use in compact electronic devices and tactile-feedback applications.It offers reliability in user interface controls. Omron B3SZ0004M SMT Key Switch Compact 160gf Snap-Action 2.6mm Height