Why does the sound of OPPO charging ring twice, and the charging also slows down?

There will be no ringing twice when charging, unless a non-original charger is used.

If the charging slows down, it may be because I didn't use the original charger to charge my phone.

The sound of OPPO's phone charging will ring twice, and the charging will also be slow, so it may be a problem with the phone's sound effect. The normal thing is that the charger will ring a bit. If it's a recently updated system, you can choose to revert to your previous operating system.

If this happens, it should be the reason for the mobile phone or battery, and it is recommended to consult the after-sales service to see what the specific reason is.

Reasons for the noise of mobile phone charging:

The charger uses a high-frequency electromagnetic field for energy conversion and voltage adjustment. When the internal device is under force, it will produce a slight vibration, and the vibration will bring sound, so please use it with confidence.

If you find it louder, we recommend that you do it:

1. Please make sure to use the original OPPO charging head and charging cable.

2. Try to replace the adapter and data cable to check whether it is caused by the adapter or data cable.

If the above methods still do not solve your problem, please bring the purchase invoice, warranty card, mobile phone, and charger to the nearest OPPO customer service center for testing and processing.

This is available for all OPPO models.

1. If it is a newly purchased charger, it is okay to have a sizzling sound when charging, and it can be used normally.

2. If the charger has been used for a long time, it is recommended to buy a new one, and the sizzling sound may be a problem with the transformer element inside the charge.

3. Of course, if you don't feel at ease, or buy a new comparison, there is no sound under normal circumstances.

The OPPO R9 charger is generally the sound of electricity when charging.

OPPO power bank uses sound, if the sound is relatively small, it is generally the sound of current, which is a normal phenomenon and can be used with confidence.

OPPO products are strictly inspected for quality before leaving the factory, and the quality is guaranteed.

If the sound is loud and needs attention, it is recommended to bring the power bank and the three-pack voucher to the local OPPO customer service center for testing and processing.

Mine too, I don't know what's wrong.