The CM-400R-3 from Camden Door Controls is a single gang, N/O contacts, red button with 'PUSH TO OPEN', black text. Camden Door Controls CM-400 Series mushroom push switches are medium-duty push-button controls. buttons are available in red, blue, or green (other colors on request), with a 1 0.6" (40 mm) diameter. The buttons are free-spinning, for protection against vandalism. They are supplied with an industrial grade stainless steel faceplate, in one gang or two gang widths. The switches are UL /CSA approved, rated 6 AMPS at 30V DC. Select models are UL294.