I used 18IV, and there is also a round swan logo in rubber under the panel. I bought it in 212.

It's said that Huiwei has a method to distinguish the true from the false, that is, turn off the power of the speaker when listening to music, instead of turning off the switch on the machine, unplug it, and the speaker can continue to sound for 2-3 seconds. The landlord can try it.