This product is specially made for Hifi amplifier or car audio/stereo. Just connect the USB to the Power and plug the two RCA into the Hifi/Amplifier/car radio,connect your phone with bluetooth. You can hear music from the speakers. It can be used for any phone,pad,mp3,etc if only they have bluetooth function. Cable length:100cm 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.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. 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!