OPPO has introduced the Enco Free4 earbuds in China, as promised. They provide 55dB active noise cancellation (ANC) across a 5500Hz frequency range, detecting noise 800 times per second for a 200% improvement in human voice suppression, certified by TÜV Rheinland. Continue reading “OPPO Enco Free4 with up to 55dB ANC, LHDC announced”