Wireless charging is one of the best solution for wired charger's inevitable break. Just simply put your phone on the charger and that's it, it starts to charge. Although it is called wireless, they are still not completely wireless, like wireless network or a wireless game controller. Devices should be placed so close to the charger, or else it won't charge. Now we are introduced to are called 'Qi' wireless charging. There will be two coils, one on the device and other inside the charging pad. If they are brought close to each other , the electro magnetic field between each other will be converted in to power for the phone. But Devices can only be charged, if it is in the range of the changer, which is really short. In shots you can call it a contact charger. When we use the smartphone while charging , it has to stop, but with the wired connection your smartphone can keep going. Pi charger ...