The Vivo Y17S (4/64GB) smartphone likely features:

1. Display: A sizable display, possibly in the range of 6.0 to 6.5 inches, with at least HD+ resolution.

2. Processor: A mid-range processor to provide a balance between performance and efficiency.

3. RAM and Storage: 4GB of RAM for multitasking and 64GB of internal storage for apps, media, and files.

4. Battery: A decent-sized battery, perhaps around 4000mAh or more, for extended usage.

5. Camera: A dual or triple-camera setup on the rear, likely featuring a combination of standard, ultra-wide, and depth sensors. The front camera may be suitable for selfies and video calls.

6. Operating System: Running on Android OS, with Vivo's custom UI skin on top.

7. Connectivity: Support for standard connectivity options such as 4G LTE, Wi-Fi, Bluetooth, and GPS.

8. Design: A sleek and modern design, possibly featuring a plastic or glass back.

9. Biometric Security: Fingerprint sensor and/or facial recognition for device security.

10. Additional Features: Depending on the model, it may include features like fast charging, AI enhancements for the camera, and various software optimizations.