kwmobile® USB 2.0 Adapter with magnetic port for Sony Xperia Z3 / Z3 Compact in Black (Wireless Phone Accessory)
Apart from the dock Sony DK48 I do not see how a simple magnet can hold a connector for charging. I bought it, hey it was cheap, I lost some money but a council of not buy it, it is useless. Also it took 2 weeks to receive it.