We live in a wireless world. Except we don't. Sure, we could send huge amounts of data through radio waves, but the device capable of receiving and sending it is tied to electrical chains. Batteries allow for some independence but ultimately most of us have to get back to the front of the outlet. You can also build your power setup now by choosing the wireless charger for your phone.
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How wireless charging works
The term "wireless charging" generally describes inductive charging. This technology uses a charging station that produces an alternating magnetic field. A computer device with a suitable induction coil will draw power from that area when it gets close, causing it to receive power. without a physical link.
Cordless toothbrushes, in addition to various hygienic appliances, have used inductive charging for quite some time. Traditionally, technology has struggled with reduced efficiency and trickle loading, but those weren't seen as a downside for toilet appliances that can only be used for a couple of minutes a day.
Inductive charging is not magic. It requires specific hardware to function and the hardware must be integrated into a device. Most appliances would not require built-in inductive charging coils, so a sleeve or connector must be attached to allow inductive charging.
The disadvantages of inductive charging
Inductive charging is based on magnetic locations. These can be powerful, but generally have a short range of influence unless an exceptional supply of magnetism can be obtained (Earth has a magnetic field simply because it also offers a massive molten metal center). Small inductive charging stations are no different.