ITEM NAME:10pcs audio transformer 600:600 ohm 1:1 EI14 isolation transformer ringingly.Model: EI14. AC impedance: EI14 600 : 600 Ohm. Inductance: 290mH ( ±20%). Alternating-current impedance value: 600. DC resistance: 135( ±%). Selection of quality, long life. Secondary coils: 800 turns.