Oppo has teased a new wireless charging solution that works when a phone is up to 10 cm (3.9 inches) away from a charging pad. The company has shown off its Wireless Air Charging tech in a 30-second clip on its Weibo page to coincide with MWC Shanghai. The clip shows the Oppo X 2021 rollable concept phone, announced in November, charging above the pad, even when held at an angle. The technology offers charging speeds of up to 7.5W, Oppo says.