The OPPO Watch Free Black offers a sleek 1.64‑inch AMOLED display with 280×456 resolution, 5ATM water resistance, Bluetooth 5.0 connectivity, and a lightweight silicone band. Its 230 mAh battery delivers up to two weeks of use, while built‑in heart‑rate, SpO₂, sleep tracking and over 100 workout modes keep health data in sync with Android or iOS.