Extra series audio entrance panel with stainless steel cover and nameplate backlighting. To be completed with single button art. ET9211 (pack of 4+4 units) to offer 8 call buttons, or with double-height button art. ET9210 (pack of 2+2 units) to offer 4 call buttons. The entrance panel can be surface-mounted or flush-mounted using the relevant accessories supplied. Traditional 4 + N wiring system. Dimensions L x H x D): 95x165x6.5 mm (flush) - 95x165x25 mm (surface-mounted).