So you upgraded your pre-iPhone 5 whatever / last gen ipod to the latest and greatest Apple release? But now you have stereo docks, and charger docks with 30 pins that are attractive paperweights, and incompatible with your super cool lightening based iPhone/iPod. Unless they have blutetooth capability built in, you won't be hearing any music now either. Well this bundle of joy fixes all that, in a wonderfully inelegant way. Just pop this onto the 30 pin plug on your docks, or on the end of your usb 30 pin charger cables, and you have this dangling cable to plug your new phones into to charge them and/or transmit your music to your stereos. It worked on my Pioneer stereo dock/ and my Bose too, more importantly it worked in my '08 Nissan's built in ipod charger cable as well. Of course now I have a black cable with an 8 inch white cable attached at the end, but it works. So unless you plan to upgrade all your chargers and cables, you can use this to make those 30 pin docks' lifespan last a little bit longer. I can't speak to the durability test, since i have only owned it for a few months, but it appears to be holding up well.