b'Accessories and SparesMB SystemAccessoriesST5311 Rocker Switch Blind group control button as built-in version (rocker switch) Only available in black. diam.: 25x31.5x29.1 mm (WxHxD)ST9304 Wall Mounted Box 4 modules Wall mounted Box for power suppliers or control units diam.: 110x180x82 mm (WxHxD)16'