Two-Wire Audio Door Entry Kit: D5S20H + D30H40

Two-Wire Audio Door Entry Kit (door phone) : Indoor phone: D30H40 Door station: D5S20H 1) 2-wire connection and DIY installation 2) Door station: Metal panel,surface mounted, Ding-dong ring, water-proof,dust-proof and nameplate changeable 3) Indoor phone: H4-shell mute type for youroptional.Remote unlock. 4) Kit includes one door station ,one indoor phone , one power supply and 15 meters 2-core wire. 5) Unlocking time adjustable,range from 1 second to 10 seconds. 6) Exit unlock button optional. 7) Indoor phone: D30H40 88(W) x 201(H) x 62(D)mm Door station: D5S20H 126(H) X 92(W) X 28(D) mm