Xiaomi K40S Redmi 5G Smartphone: Qualcomm Snapdragon 870 processor
Meet the Xiaomi Redmi K40S 5G – not just any smartphone, but a speed demon dressed in sleek tech. At its heart? A Qualcomm Snapdragon 870 octa-core processor that rockets up to 3.2GHz, paired with a generous 12GB RAM and 256GB storage. Translation: it's like giving your digital life a shot of espresso.
Then there's the display – oh, the display. A 6.67-inch 120Hz E4 AMOLED full screen that's as smooth as butter, wrapped in Corning Gorilla Glass 5 because accidents happen. With HDR10+ and an eye protection mode, it's not just about seeing; it's about seeing comfortably (your eyes will thank you).
For the shutterbugs, this phone is a dream. A 48MP ultra-high resolution primary camera captures the world in stunning detail, while an 8MP ultra-wide-angle camera and a 2MP macro camera ensure you never miss a shot, no matter how close or far. And for those selfie moments? A 20MP AI front camera turns every snap into a masterpiece (filter game strong).
Powering through your day is a 4500mAh battery – because who has time to charge constantly? Plus, with 5G networks, you're always in the fast lane. And let's not forget the extras: NFC for tap-and-go payments, an IR blaster to control your gadgets, and dual SIM support because why choose one when you can have both?
- 12GB RAM + 256GB storage
- 6.67 inch 120Hz AMOLED screen
- 48MP triple rear cameras
- 4500mAh battery
- 5G network support
- Qualcomm Snapdragon 870 processor
General specs
- Brand: Xiaomi
- Model: K40S
- Seller: Sunsky
- Processor: Qualcomm Snapdragon 870 octa-core Kryo 585 7nm, up to 3.2GHz
- Memory: 12GB RAM, 256GB storage
- Display: 6.67 inch Pole Notch 120Hz E4 AMOLED full screen, 2400 x 1080 FHD+, Corning Gorilla Glass 5
- Camera: 48MP IMX582 primary camera, 8MP 119° ultra wide-angle camera, 2MP macro camera, 20MP AI front camera
- Battery: 4500mAh
- Network: 5G, 4G LTE, 3G, 2G, Dual SIM
- Additional Features: NFC, IR blaster, Fingerprint identification, MIUI 13
- First listed by seller: 5/20/25
If you are interested in more details, you can find full information on the seller's page.
Shipping options
United States
Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Xiaomi K40S Qualcomm Snapdragon 870 processor
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Xiaomi Note 12 5G Qualcomm Snapdragon 4 Gen1 processor
|
Xiaomi Note 12 5G Qualcomm Snapdragon 4 Gen1 processor
|
Xiaomi F4 GT Snapdragon 8 Gen 1 octa core
|
Xiaomi 13 Qualcomm Snapdragon 8 Gen 2 octa core
|
Xiaomi 13 Ultra Qualcomm Snapdragon 8 Gen2 processor
|
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| Brand | Xiaomi | Xiaomi | Xiaomi | Xiaomi | Xiaomi | Xiaomi |
| Model | K40S | Note 12 5G | Note 12 5G | F4 GT | 13 | 13 Ultra |
| Color | ||||||
| Rating |
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| Price | $365.75 | $173.00 | $164.00 | $369.55 | $565.00 | $654.00 |
| Seller | Sunsky | Sunsky | Sunsky | Sunsky | Sunsky | Sunsky |
| Update | August 19, 2025 | August 19, 2025 | August 19, 2025 | July 28, 2025 | July 1, 2025 | August 19, 2025 |
| Processor | Qualcomm Snapdragon 870 octa-core Kryo 585 7nm, up to 3.2GHz | Qualcomm Snapdragon 4 Gen1 octa-core, up to 2.0GHz | Qualcomm Snapdragon 4 Gen1 octa-core, 6nm, up to 2.0GHz | Snapdragon 8 Gen 1 octa core 4nm up to 3.0GHz | Qualcomm Snapdragon 8 Gen 2 octa core (3.2GHz Cortex-X3 x 1 + 2.8GHz Cortex A715 x 2 + 2.8GHz Cortex A710 x 2 + 2.0GHz Cortex-A510 x 3) | Qualcomm Snapdragon 8 Gen2 4nm octa-core 3.19GHz |
| Memory | 12GB RAM, 256GB storage | 12GB RAM, 256GB storage | 16GB RAM, 512GB storage | |||
| Display | 6.67 inch Pole Notch 120Hz E4 AMOLED full screen, 2400 x 1080 FHD+, Corning Gorilla Glass 5 | 6.67 inch 120Hz GOLED, 2400 x 1080 FHD+, 240Hz sampling rate | 6.67 inch 120Hz GOLED, 2400 x 1080 FHD+, 240Hz sampling rate, 4096-level dimming, SGS low blue light certified | 6.67 inch flat AMOLED DotDisplay full screen, 2400 x 1080 pixels resolution FHD+, 120Hz display frame rate | 6.36 inch 2400x1080 OLED, 120Hz refresh rate, 480Hz touch sampling rate, Corning Gorilla Victus glass, HDR10+, 1900nits peak brightness | 6.73 inch 2K OLED, 120Hz refresh rate, 2600nit brightness |
| Camera | 48MP IMX582 primary camera, 8MP 119° ultra wide-angle camera, 2MP macro camera, 20MP AI front camera | 48MP primary + 2MP depth rear, 8MP front | 48MP primary + 2MP depth rear cameras, 8MP front camera | 64MP main camera, 8MP wide angle camera, 2MP macro camera, 20MP front camera | 50MP Leica main (f/1.8), 10MP Leica telephoto (f/2.0), 12MP Leica ultra-wide angle (f/2.2), 32MP front (f/2.0) | 50MP Quad Leica cameras, 32MP front camera |
| Battery | 4500mAh | 5000mAh | 5000mAh | 4700mAh non-removable lithium-ion polymer | 4500mAh, 67W wired charging, 50W wireless charging, 10W wireless reverse charging | 5000mAh |
| Network | 5G, 4G LTE, 3G, 2G, Dual SIM | 5G, Dual SIM | 5G N1/N3/N5/N8/N28A/N41/N77/N78, 4G FDD-LTE B1/B3/B5/B7/B8, TDD-LTE B34/B38/B39/B40/B41, 3G WCDMA B1/B2/B5/B8, 2G GSM B2/B3/B5/B8 | 5G, 4G LTE, 3G, 2G | 5G: n1/n3/n5/n8/n28a/n38/n40/n41/n77/n78, 4G: FDD-LTE B1/B3/B4/B8/B18/B19/B26, TDD-LTE: B34/B38/B39/B40/B41/B42, 3G: WCDMA: B1/B4/B6/B8/B19, 2G: GSM: B3/B5/B8; CDMA 1x: BC0 | 5G, NFC, Wireless charging |
| Storage | 8GB RAM + 128GB | 6GB RAM + 128GB | 12GB RAM, 256GB internal storage | |||
Redmi K40S 5G Smartphone
Brittany H.
New York, NY
May 28, 2025
I got this Xiaomi phone a couple months back and overall it's been a solid choice. As someone who's into DIY and repairs I appreciate how well it's built and the performance is top notch for the price. The display is vibrant and easy on the eyes even after long use. Battery life is impressive I rarely need to charge it during the day. The camera is decent for everyday photos though not perfect in dim settings. I like the extra features like being able to control other devices and the dual SIM support is convenient. It's not flawless but for what it offers it's a great value. I'd recommend it to others looking for a reliable device without breaking the bank.
- Pros: The phone is super fast and handles everything I throw at it without a hiccup. The screen looks amazing and feels smooth to scroll through. The battery lasts all day even with heavy use which is a huge plus for me. I love that it has support for the latest networks making downloads and streaming really quick. The camera takes sharp photos in good light and the extra lenses are handy for different shots.
- Cons: Shipping took longer than expected which was a bit annoying. The camera struggles in low light and photos can come out grainy. It could be wrong but I feel like the phone gets warm during intense tasks. The storage is fixed so no way to add more which might be a downside for some.