Available Variants
Full Specifications
Upgrade Worth It?Network
| Technology | GSM / CDMA / HSPA / CDMA2000 / LTE / 5G |
| 2G bands | GSM 850 / 900 / 1800 / 1900, CDMA 800 |
| 3G bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100, CDMA2000 1x |
| 4G bands | 1, 2, 3, 4, 5, 7, 8, 18, 19, 26, 28, 34, 38, 39, 40, 41, 42 |
| 5G bands | 1, 3, 28, 41, 77, 78 |
| Speed | HSPA, LTE, 5G |
Launch
| Announced | 2021, February 25 |
| Status | Available. Released 2021, March 04 |
Body
| Dimensions | 163.7 x 76.4 x 7.8 mm (6.44 x 3.01 x 0.31 in) |
| Weight | 196 g (6.91 oz) |
| SIM | Nano-SIM + Nano-SIM |
Display
| Type | Super AMOLED, 120Hz, HDR10+, 1300 nits (peak) |
| Size | 6.67 inches, 107.4 cm2 (~85.9% screen-to-body ratio) |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~395 ppi density) |
| Protection | Corning Gorilla Glass 5 |
Hardware & Software
| OS | Android 11, MIUI 12 |
| Chipset | Qualcomm SM8250-AC Snapdragon 870 5G (7 nm) |
| CPU | Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585) |
| GPU | Adreno 650 |
Memory & Storage
| Card slot | No |
| Internal | 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM, UFS 3.1 |
Main Camera
| Triple | 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide) 5 MP, f/2.4, 50mm (macro) |
| Features | Color spectrum sensor, LED flash, HDR, panorama |
| Video | 4K@30fps, 1080p@30/60/120/240/960fps, gyro-EIS |
Selfie Camera
| Single | 20 MP, f/2.5, (wide), 1/3.4", 0.8µm |
| Features | HDR |
| Video | 1080p@30fps, 720p@120fps |
Sound
| Loudspeaker | Yes, with stereo speakers |
| 3.5mm jack | No |
| Audio Quality | 24-bit/192kHz Hi-Res audio |
Connectivity
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct |
| Bluetooth | 5.1, A2DP, LE |
| Positioning | GPS (L1+L5), GLONASS (G1), BDS (B1I+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC |
| NFC | Yes |
| Infrared port | Yes |
| Radio | No |
| USB | USB Type-C 2.0, OTG |
Features
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass |
Battery
| Type | Li-Po 4520 mAh |
| Charging | 33W wired, PD3.0, QC3, 100% in 52 min |
Community Discussions
(0)No Discussions Yet
Be the first to ask a question, share a review, or give advice about the Xiaomi Redmi K40.
Start a DiscussionFrequently Asked Questions
Description
Overview & Display
The Xiaomi Redmi K40 presents a sleek and modern design, measuring 163.7 x 76.4 x 7.8 mm and weighing 196g. Its Super AMOLED display immediately grabs your attention, boasting a vibrant 120Hz refresh rate for incredibly smooth scrolling and animations. With a peak brightness of 1300 nits, the screen should remain easily viewable even under bright sunlight. The expansive 6.67-inch display, covering a generous 85.9% of the front surface, offers an immersive multimedia experience, enhanced by HDR10+ support for richer colors and contrast. Corning Gorilla Glass 5 provides a reassuring layer of protection against scratches and minor drops.
Powering the Xiaomi Redmi K40 is a Qualcomm SM8250-AC Snapdragon 870 5G chipset, paired with options for 6GB, 8GB, or 12GB of RAM, depending on the configuration. Storage ranges from 128GB to 256GB using fast UFS 3.1 technology. Running on Android 11 with MIUI 12, the phone promises a familiar and customizable user experience. The octa-core processor and ample RAM should handle daily multitasking with ease, allowing for smooth app switching and responsive performance. The device also supports 5G connectivity, ensuring fast download and streaming speeds where available.
Camera & Battery
The rear camera system on the Xiaomi Redmi K40 features a versatile triple lens setup. A 48MP primary sensor, complemented by an ultrawide 8MP lens and a macro 5MP lens, provides flexibility for various shooting scenarios. The inclusion of a color spectrum sensor suggests an effort to capture accurate and pleasing colors. Video recording capabilities extend up to 4K resolution at 30fps, and the gyro-EIS feature helps stabilize footage. For those who enjoy selfies, a 20MP front-facing camera is on hand, promising detailed self-portraits and video calls.
Battery life is a key consideration, and the Redmi K40 houses a substantial 4520 mAh battery. Coupled with 33W wired charging capable of reaching 100% in approximately 52 minutes using PD3.0 or QC3 protocols, the device should easily last a full day for typical users. The presence of stereo speakers further enhances the multimedia experience, while Hi-Res audio support ensures high-quality sound reproduction. The absence of a 3.5mm headphone jack might be a drawback for some, requiring the use of USB-C headphones or an adapter.
Who Should Buy This
The Xiaomi Redmi K40 is an excellent choice for users seeking a blend of performance, features, and a vibrant display without breaking the bank. It's well-suited for those who enjoy streaming videos, playing mobile games, and staying connected on the go. The versatile camera system caters to casual photography enthusiasts. However, users prioritizing expandable storage via a microSD card might find the lack of a card slot limiting. Ultimately, the Redmi K40 targets users who value a smooth, responsive experience and a high-quality display in a well-designed package.
Pros
- Vibrant 120Hz Super AMOLED display
- Powerful Snapdragon 870 5G processor
- Versatile triple-lens rear camera
- Fast 33W wired charging
- Stereo speakers for immersive audio
Cons
- No microSD card slot for storage expansion
- Lacks a 3.5mm headphone jack
- Android 11 may feel dated to some
- No wireless charging support
Verdict
The Xiaomi Redmi K40 delivers a compelling overall experience, offering a potent combination of performance and features. Its standout attribute is the exceptionally smooth 120Hz display, paired with the capable Snapdragon 870 chipset. While the lack of expandable storage and headphone jack are limitations to consider, the quick charging and versatile camera system make it a strong contender in its category. For users seeking a high-performing smartphone with a stunning display, the Redmi K40 is a worthwhile option.
Write a Review
Reviews (3)
Upgrade Worth It?
Using an older phone?
Compare your current device with Xiaomi Redmi K40 to analyze performance gains and price difference.
Camera Samples
Performance & Features
Estimated average on high settings
Screen-on time (mixed usage)
Based on AI analysis
* These values are calculated automatically by our system and may not be 100% accurate.