Corded 4-line telephone with base speakerphone and expandable to 16 stationsDSL Subscribers may need to us a DSL FilterHeadset Compatible : 2.5mm jackAT&T 1040 Corded Phone, Black/Silver, 1 HandsetBrand: AT&T, Model: 1040, Color: BLACK/WHITE, Size: 11.70in. x 10.10in. x 4.60in.