Oppo A51F Manual page 18

If you are using pacemaker, hearing aid, cochlear implant or other device, please use the phone
according to the doctor's advice.
Additional Important Health and Safety Information
Please do not use the phone if antenna is damaged. Otherwise, it may cause personal injury.
Do not place the phone near magnetic card and other magnetic objects, as information stored in a
floppy disc, memory card and credit card might be damaged by phone's magnetic radiation.
Please place drawing pins and other metallic objects far away from phone receiver. As there is magnetic
effect/field when the phone speaker works, these small metallic objects may be attracted to the device
and personal injury and phone damage may be caused.
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