The DA541 from NY Wholesale Intercom is a 4 Apartment Audio Only Handsfree Kit which includes DJ5A Handsfree indoor audio station (Qty 4), DMR11SA/S4 Outdoor panel, RH-MR11 Surface box, DR30/24 UL power supply 24Vdc 1,5A, DT/DPS/DR Power separator, DT-DBC4A 4 Branches distributor, DS-ERL Relay, AC Cord.