Series 18 Switch Range EAO Series 18 Switch Range features miniature push buttons and indicators with a low back-of-panel depth profile. Momentary and maintained versions are available with tactile feedback. Illumination is diffused evenly across the lens and is produced by an integrated LED. Series 18 units are available in standard panel mount (8mm cut-out) or flush mount styles (16mm cut-out). Options include round, square, or rectangular variants.