The present application provides a key assembly for use in an electronic device. The key assembly comprises a plurality of dome switches and one or more single-piece keycaps. Each keycap has a plurality of key portions separated by deforming portions. The key assembly further comprises a plurality of actuators for activating the dome switches. Each actuator has a stem portion and an enlarged rigid blocking portion. The key assembly also comprises one or more rigid blocking members disposed between the blocking portion of the actuators and the keycaps and in close proximity to the blocking portion of the actuators. The blocking members form a barrier to limit a rotational movement of the actuators away from the dome switches.