Key Features:

1. 5G Connectivity: The "5G" in the name indicates that this phone supports 5G networks, providing faster internet speeds and improved network performance compared to older generation networks.

2. Display: It likely features a high-resolution and vivid display for a great visual experience. The size and type of display (e.g., AMOLED, IPS) may vary.

3. Performance: With 8GB of RAM, this phone should be capable of handling multitasking and running demanding applications smoothly.

4. Storage: 128GB of internal storage provides ample space for apps, photos, videos, and other data.

5. Camera: OPPO smartphones are known for their camera capabilities. You can expect multiple camera lenses for versatile photography, including wide-angle, ultra-wide, and perhaps macro or telephoto lenses. The exact specifications may vary.

6. Battery: It should have a decent-sized battery to keep the phone running throughout the day, and it may support fast charging technology.

7. Operating System: OPPO typically runs on Android with the company's custom skin on top. The specific version of Android and the user interface design may vary.

8. Design: The "Rainbow Spectrum" color option suggests a colorful and eye-catching design. The phone's physical design may feature a slim profile, premium materials, and modern aesthetics.

9. Additional Features: It may have other features like a fingerprint sensor (likely in-display), face unlock, audio enhancements, and various software enhancements.