The wireless charging system is capable of charging the battery of a phone without any type of wire. However, the sad thing is that not all phones have this system. The Oppo A57 is a phone that does not support wireless charging.
Actually, Oppo A57 doesn’t support the wireless charging system. But the phone supports a fast-charging system. The phone brings a 33-Watt fast charger that will take a very short time to charge this phone. However, you won’t get the wireless charging facility on the A57.