Here are details for the OPPO K13x 5G 4GB + 128GB smartphone variant you asked about — a budget-friendly 5G phone from OPPO available in India: (OPPO)

📱 OPPO K13x 5G (4 GB RAM + 128 GB storage) – Quick Specs

💰 Price
• Retail price around ₹11,999 in India for the 4 GB + 128 GB model (effective discounts and launch offers often bring it down close to ~₹10,999). (OPPO)

📱 Display
• Large 6.67-inch HD+ LCD panel with 120 Hz refresh rate for smooth scrolling/viewing. (Business Today)

📟 Performance
• MediaTek Dimensity 6300 5G chipset (efficient mid-range 5G SoC)
• LPDDR4X RAM + UFS 2.2 storage
• Runs ColorOS 15 based on Android 15. (Business Today)

📸 Cameras
• 50 MP primary rear camera + 2 MP secondary sensor
• 8 MP front camera for selfies/videos. (Business Today)

🔋 Battery & Charging
• Huge 6000 mAh battery with 45W SuperVOOC fast charging support. (Business Today)

📡 Connectivity & Extras
• 5G support, side-mounted fingerprint sensor, dual-SIM, Wi-Fi, Bluetooth, USB-C
• Built with an aerospace-grade 360° Damage-Proof Armour Body and IP65 water/dust resistance. (OPPO)

🎨 Colour Options
• Available in Midnight Violet and Sunset Peach finishes. (Business Today)

🧠 Summary

Pros:
✅ Large battery with fast charging
✅ Durable build + water/dust resistance
✅ Smooth 120 Hz display
✅ Budget 5G performance
✅ Clean modern Android UI with AI tools (Business Today)

Considerations:
⚠️ 4 GB RAM is entry-level — good for everyday use but moderate for heavy multitasking/gaming.
⚠️ Display is HD+ (not Full HD), but still smooth thanks to 120 Hz. (Business Today)

If you want, I can compare this 4 GB variant against the 6 GB or 8 GB versions (or suggest similar phones under ₹15,000). Just let me know!