Looks like two small pucks, transmits up to 10 W
California inventor Peter Bevelacqua has come up with a device called the Power Mole that can transmit electricity wirelessly through window glass. This solution is useful, for example, if some low-power device needs power, such as a video surveillance camera or a lamp outside the house, and all the sockets are located inside.
Power Mole consists of two puck-shaped elements: one of them (the transmitter) is attached to the glass inside the house, and the other (the receiver) — outside. The transmitter is connected to a regular outlet in the house, and the receiver — to the device externally via USB. This kit can transmit up to 10 W of electricity; it works on the principle of electromagnetic induction, like a wireless charger for smartphones.
The development is compatible not only with glass, but also with other materials, for example, wood or any other non-metallic surface, only its thickness should not exceed 30 mm. If metal is detected between the transmitter and receiver, the transmitter will automatically turn off. It is worth noting that the efficiency of the Power Mole is lower than with the usual method of connecting to a power outlet via a wire: for a camera with a power consumption of about 5 W, the efficiency of the device varies from 50% (at a distance of 30 mm) to 75% (at a distance less than 6 mm).
Now the Power Mole project is posted on the Kickstarter crowdfunding platform, if it comes to the release of such devices, then in the USA a set of a receiver, a transmitter with a power cable and two stickers for attaching to glass can be bought for $59. If successful, the development may enter the international market.