Powercast, Ossia provide wireless charging for sensors | FierceElectronics
Wouldn’t it be wonderful if, while you’re waiting to catch a plane at the airport, your smartphone could be charging with power through the air? That way, you don’t have to go sit on the floor in the corner next to a power outlet. Well, sorry to disappoint, but that’s not going to happen for the foreseeable future. There are a couple of obstacles that engineers aren’t even close to solving: consumer safety and power efficiency, which diminishes with distance.