Features: Selection of high quality material, work stable, practical convenience, and with long severing life. These isolation transformers are all high efficiency audio transformers. The primary and secondary windings are tightly coupled, there is sufficient pass frequency band, the original winding inductance is large, the leakage inductance is small, can reduce the influence of the hysteresis loss.Specifications: Voltage ratio: 1:1 AC Impedance: 600 ohms DC Impedance: 135 ohmsPower supply phase: single phase Moisture-proof mode: open Cooling mode: oil immersed air cooled Frequency characteristics: intermediate frequency Windability : Double-wire winding Core form: amorphous alloy Core shape: EI type Appearance structure: vertical Weight: 40 g Package Included: 1 x 10pcs/pack Audio Transformers. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 419 hours Hope you have a pleasant shopping experience!