Check the listing for details. Four Channel Ground Loop Isolator Audio Curciut Noise Filter 4RCA AP3054. Condition: New. Listed at 22.99 USD. Isolate and eliminate noise caused by a ground loop in an audio circuit with this Four-Channel Ground Loop Isolator. The isolator ensures that the shield ground on each audio cable is isolated from any equipment ground, which could cause audible noise when amplified. This device has four channels, composed of two pairs of stereo (L+R) inputs and outputs. The nominal DC impedance of the device is 100 ohms and the audio impedance is 3500 ohms at 1000 Hz. The nominal input power is 50 watts, with a maximum power level of 100 watts. High quality!!! About Payment:We accept Paypal only. About shipping:We send the goods in 1 working day after received your payment.Monday to Friday.(Beijing Time)We ship worldwide,if your country is not in the list,pls contact us freely.We are happy to help you.Normally it takes 7-15 working days for E-packet shipping to US.Some items we ship from US by USPS and it takes 2-5 working days to reach your hand.It takes 30-40 working days for Ecomonic Int'l Shipping to worldwide.For Working days,the weekends are excluded.The custom fee will be paid by customer. Some delay may be caused by custom inspection.Pls be enough patient with the shipping time!If you can not wait,you can ask for sending by DHL/FEDEX/UPS,etc,just pay a little more freight.Pls contact us in advance. About return:Some times the product may be damaged in transportation or we sent the wrong items to you.Pls send us pictures and you will get refund.Pls don’t leave negative/neutral feedback without contacting us.There will be many ways to solve any problems. Enjoy the shopping in our store!