9.5K reactions · 220 shares | The quality of OPPO products is one of our top priorities. The #OPPOF21ProSeries adopts IPX4 standard for water resistance testing; the phones are sprayed with water onto the four surfaces at a 75° angle, and are also placed underwater at a depth of 20cm for 30sec to deliver #OPPOQualityPromise. | OPPO | Facebook