The audio isolation transformer is made of permalloy material and is of high quality. High-end audio isolation cow, suitable for various uses: balanced to unbalanced, balanced to balanced, mutual conversion interface isolation to eliminate current sound, RCA to RCA. Be used for Audio isolation, Audio balance conversion rca, Audio distribution, Audio noise reduction, purification, sound quality, etc... Frequency response: 60Hz~2KHz REF 1KHz, 2db TURN RATIO: 1-3:4-6=1:1 HI-POT=1000VAC,1MA 2SEC(PRI-SEC) Impedance ratio600:600 Colour:silver gray Material:Permalloy Package Contents: 1 x Audio Signal Isolation Transformer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.