This transformer is an improved version of the JT-11P- audio transformer, utilizing advanced winding techniques such as layered winding, segmented winding, and reverse winding to reduce frequency/phase distortion, minimize leakage inductance and distributed capacitance, and extend frequency response. Pure copper, gold-plated connector for smooth and secure connection. Aluminum alloy housing with anodized treatment. Polished finish for a comfortable feel and elegant appearance. The transformer uses a 80% -iron alloy shield (not aluminum or pure iron), a high-grade aerospace material, for superior shielding against electromagnetic interference. Frequency response: 20Hz-90kHz -0.5dB DC withstand voltage: 1000V Maximum signal current: 15mA Color: Silver Material: Aluminum Alloy Package Contents: 1 x Audio 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.