MODEL1330 MODEL1530

12VDC 500MA POWER SUPPLY - 5.5MM OD PLUG - Primary Compatible AT&T UnitsThis exact 12VDC, 500mA transformer with a 5.5mm Outer Diameter (OD) barrel plug shipped standard with:AT&T Model 1330 Multi-line Speakerphone SystemAT&T Model 1530 Speakerphone / Digital Answering Machine SystemAT&T 900 MHz Cordless Series (Select legacy base stations from the late 90s)