DailyTechPricesDevice Comparison
| Redmi K20 | C66 | |
|---|---|---|
| LAUNCH DATE | ||
| Announced | July 17, 2019 | 22 December 2025 (official Oukitel store listing) |
| Released | 2019, July | 22 December 2025 |
| Status | Discontinued | Available |
| NETWORK | ||
| 2G Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM B2 / B3 / B5 / B8 |
| 3G Bands | HSDPA 850 / 900 / 2100 | WCDMA B1 / B2 / B4 / B5 / B8 |
| 4G LTE | 1, 3, 5, 7, 8, 34, 38, 39, 40, 41 | FDD 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 28AB, 66; TDD 34, 38, 39, 40, 41 |
| 5G | No | No |
| EDGE/GPRS | — | Yes |
| Speed | LTE | HSPA, LTE |
| Technology | 4G/LTE/GSM | GSM / HSPA / LTE |
| BODY | ||
| Build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame | Glass front (Panda glass) |
| Dimensions | 156.7 x 74.3 x 8.8 mm (6.17 x 2.93 x 0.35 in) | 164.5 x 78 x 8.7 mm |
| IP Rating | No IP rating | — |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + Nano-SIM (or Nano-SIM + microSD) |
| Weight | 191 g (6.74 oz) | 195 g |
| DISPLAY | ||
| Brightness | 430 nits (typ), 600 nits (peak) | 450 nits |
| Protection | Corning Gorilla Glass 5 | Panda glass |
| Refresh Rate | 60Hz | 120Hz |
| Resolution | 1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density) | 720 x 1560 pixels (~255 ppi density) |
| Screen-to-body | ~86.1% | — |
| Size | 6.39 inches, 100.2 cm2 (~86.1% screen-to-body ratio) | 6.73 inches |
| Type | Super AMOLED, HDR | HD+ display, 120Hz, 450 nits |
| PLATFORM | ||
| CPU | Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver) | Octa-core (2x 1.8 GHz Cortex-A75 + 6x 1.6 GHz Cortex-A55) |
| Chipset | Qualcomm SDM730 Snapdragon 730 (8 nm) | Unisoc T615 (12 nm) |
| GPU | Adreno 618 | Mali-G57 (1 core @ 850 MHz) |
| OS | Android 9.0 (Pie), upgradable to Android 10, MIUI 12 | Android 16 (OTA supported) |
| MEMORY | ||
| Card slot | No | microSD, up to 1TB (uses SIM 2 slot) |
| Internal | 64GB, 128GB , 256GB | 128GB / 256GB / 512GB |
| RAM | 6GB RAM, 8GB RAM | 4GB / 8GB; virtual RAM expansion up to 16GB (4+12) / 24GB (8+16) |
| Storage Type | — | uMCP |
| Storage/RAM variants | 64GB, 128GB , 256GB; 6GB RAM, 8GB RAM | 8GB+512GB (Oukitel store); 4GB+128GB (Jumia Nigeria); spec sheet lists 4GB/8GB RAM and 128GB/256GB/512GB storage |
| MAIN CAMERA | ||
| Features | Dual-LED flash, HDR, panorama | LED flash, HDR, panorama, portrait, beauty, AI |
| MAIN CAMERA | 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.4, 53mm (telephoto), 1/4.0", 1.12µm, PDAF, 2x optical zoom 13 MP, f/2.4, 12mm (ultrawide), 1/3.1", 1.12µm | 64 MP, f/1.8, 1/2" (OmniVision OV64B40), 80.3° FoV, AF | 0.08 MP, 1/10" (GC6133), depth |
| Video | 4K@30fps, 1080p@30/120/240fps, 1080p@960fps | 1080p@30fps |
| SELFIE CAMERA | ||
| Features | HDR | Beauty mode |
| Selfie camera | Motorized pop-up 20 MP, f/2.2, (wide), 1/3.4", 0.8µm | 8 MP, f/2.0, 1/4" (Sony IMX219), 77.5° FoV, fixed focus |
| Video | 1080p@30fps | 720p@30fps |
| SOUND | ||
| 3.5mm jack | Yes | No (headphones via USB Type-C) |
| Loudspeaker | Yes, with dual speakers | Yes, with audio amplifier |
| COMMUNICATION | ||
| Bluetooth | 5.0, A2DP, LE, aptX HD | 5.2 |
| NFC | Yes (China only) | Yes |
| Positioning | GPS, GLONASS, GALILEO, BDS | GPS, GLONASS, BeiDou, Galileo |
| Radio | FM radio | No |
| USB | USB Type-C 2.0, OTG | USB Type-C, OTG |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac, dual-band 2.4G + 5G |
| FEATURES | ||
| Other features | — | 0.8 m drop resistance (16 drops); operating temperature -20°C to +55°C; protective case in box |
| Sensors | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass | Side-mounted fingerprint, accelerometer (G-sensor), compass, ambient light (no proximity sensor listed) |
| BATTERY | ||
| Capacity | 4000 mAh | 5000 mAh |
| Charging Type | 18W wired | 18W wired (50% in 40 min, 80% in 65 min, 100% in 123 min); reverse charging |
| Type | Li-Po 4000 mAh, non-removable | Li-Po (polymer) 5000 mAh |
| ADDITIONAL INFORMATION | ||
| Colors | Carbon black, Red flame, Glacier blue, Pearl White | Orange; Black; Grey; Gold; Purple |
| Compatibility | — | 4G-only (no 5G); no FM radio; no LTE band 13/71; hybrid SIM/microSD slot; Android 16 at launch |
| Launch Price (USD) | $170.00 (reference only — see Price in Nigeria above for the actual retail price) | — |
| Models | M1903F10I | C66 |
| Price in Nigeria | ₦188,000 | ₦165,600 |
| TESTS | ||
| Battery Endurance | — | Video 8 h, calling 35 h, music 24 h, gaming 8 h, standby 830 h (Oukitel manufacturer figures) |
| Performance | — | AnTuTu 10: 267,410 (Oukitel manufacturer figure) |
| SECURITY | ||
| Security | Biometric security: Fingerprint (under display, optical). | Side-mounted fingerprint; face unlock |