You Will Get HIGH QUALITY 1 x 12V 2A 24W power supply with 6.6ft power cord.

Input Voltage. 100-240V 50-60Hz

Output Voltage. 12V DC (500mA~2000mA) 24W.

Max Wattage: 24W

Waterproof: No

DC Port Diameter:Φ5.5mm*2.5mm jack or 5.5mm*2.1mm jack connector.

(Note: The applicable range is 12 volts and does not exceed 24 watts)
Note:
This adapter is Center Positive.
Before purchasing, please check your model number.

high quality power charger/adapter.
Compatible for Seagate Freeagent and WD Western Digital My Book Essential Digital External Hard Drive HDD

Compatible with:

Compatible for Seagate FreeAgent External Hard Drive HDD-Seagate BlackArmor WS 110 500gb 1tb 1.5tb 2tb / Iomega Prestige, Select Desktop / Verbatim; Expansion, Freeagent, Desk, Desk Mac, Xtreme Theater, Theater+ , DockStar Series/Edition ; P/N WA-24E12 WA24E12 DA-24B12 AC ADS-24P-12-2 1224G ADS-24S-12 1224GPCU WA-24C12U S018BU1200150 and others
Compatible for Seagate Central 2TB 3TB 4TB: STCG2000100, STCG3000100, STCG4000100
Compatible for Seagate Backup Plus 2TB 3TB 4TB 5TB 6TB 8TB: STDT2000100, STDT3000100, STDT4000100, STDT5000100, STDT6000100, STDT8000100, STDU3000101, STDU4000100
Compatible for Seagate Expansion 2TB 4TB 5TB: STBV4000100, STEB2000100, STEB3000100, STEB4000100, STEB5000100
Compatible for Seagate ST30000CB, ST30000U2, ST302504FDA1E1-RK, ST303204FDA1E1-RK, ST303204FDC1E1-RK, ST303204FPA1E2-RK, ST303204FPA1E3-RK

Compatible for WD Western Digital 160 320 500 750 GB 1 TB 1TB My Book ESSENTIAL WD2500I032-0 WD1600H1U-00 WD3200H1U-00 Compatible for WD5000H1U-00
Compatible for WD My Book WD10000EB035 WD10000H1U-00 WD1600B007 WD5000C032-002 WDBAAF0010HBK-NESN; Wd2500/032 Wd25001032 Wd25001032-001 Wd2500b012 Wd2500b014 Wd2500b015 Wd2500c032 Wd2500d032 Wd2500d032-000 Wd2500e032 Wd2500h032 Wd2500i032 Wd300a001