| Celkon A21 |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| Operating system | Android 4.2.2 (Jelly Bean) | Android 10.0; MIUI 11 |
| Processor | Quad-core 1.3 GHz Cortex-A7 | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Mediatek MT6582 (28 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | Mali-400MP2 | Adreno 618 |
| Internal memory | 512 MB, 256 MB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | microSD, up to 32 GB | microSDXC (dedicated slot) |
| Display | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| Size | 4" inc | 6.67" inc |
| Type | IPS LCD | |
| Resolution | 320 x 480 px | 1080 x 2400 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | 57.8% | 84.5% |
| Protection | Corning Gorilla Glass 5 | |
| Display area | 47.6 cm2 | 107.4 cm2 |
| Display aspect ratio | 3:2 (height:width) | 20:9 (height:width) |
| Pixel Density | 144 PPI | 395 PPI |
| Colors | 16M | |
| Other | 450 nits typ. brightness (advertised) | |
| Connectivity | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 900 / 1800 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Network | GSM / HSPA | GSM / HSPA / LTE |
| SIM card | Dual SIM (Dual stand-by) | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 4.0, A2DP | 5.0, A2DP, LE |
| Edge | Yes | Yes |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | |
| GPRS | Yes | Yes |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) | |
| GPS | No | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA | HSPA 42.2/5.76 Mbps, LTE-A |
| USB | microUSB | 2.0, Type-C 1.0 reversible connector |
| Camera | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| Main camera | 3.15 MP, Single | 48 MP, Quad |
| Specs | 3.15 MP | 48 MP, f/1.8, (wide), 1/2.25", 0.8µm, PDAF -8 MP, f/2.2, 13mm (ultrawide), 1/4.0", 1.12µm -5 MP, f/2.4, (macro), 1.12µm -2 MP, f/2.4, (depth) |
| Video | Yes | 2160p@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS |
| Selfie camera | 1.3 MP, Single | 16 MP, Single |
| Features | LED flash, HDR, panorama | |
| Multimedia | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio, recording |
| Design | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| Colors | Black, Blue, Red | Aurora Blue, Glacier White, Interstellar Black |
| Dimensions | 124.8 x 66.1 x 10.8 mm | 165.8 x 76.7 x 8.8 mm |
| Weight | 115.3 g | 209 g |
| Body build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame | |
| Battery | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| Battery life | Stand by time- Up to 120 h (3G) Talking time- Up to 8 h (3G) | |
| Battery capacity | 1500 mAh, Li-Ion | 5020 mAh, Non-removable Li-Po |
| Other | Celkon A21 | Xiaomi Redmi Note 9 Pro |
| SAR | SAR EU - 0.99 W/kg (head) 1.39 W/kg (body) | |
| Release date | 2014 | 2020, March 12 |
| Sensors | Accelerometer | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
