| BLU S1 |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | BLU S1 | Xiaomi Redmi Note 9 Pro |
| Operating system | Android 7.0 (Nougat) | Android 10.0; MIUI 11 |
| Processor | Octa-core (4x1.5 GHz Cortex-A53 & 4x1.0 GHz Cortex-A53) | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Mediatek MT6750 (28 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | Mali-T860MP2 | Adreno 618 |
| Internal memory | 16 GB, 2 GB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | microSD, up to 64 GB | microSDXC (dedicated slot) |
| Display | BLU S1 | Xiaomi Redmi Note 9 Pro |
| Type | IPS LCD | IPS LCD |
| Size | 5.2" inc | 6.67" inc |
| Resolution | 720 x 1280 px | 1080 x 2400 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Protection | Corning Gorilla Glass 5 | |
| Screen-to-Body Ratio | 69.5% | 84.5% |
| Display area | 74.5 cm2 | 107.4 cm2 |
| Display aspect ratio | 16:9 (height:width) | 20:9 (height:width) |
| Pixel Density | 282 PPI | 395 PPI |
| Colors | 16M | 16M |
| Other | 450 nits typ. brightness (advertised) | |
| Connectivity | BLU S1 | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE band 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 12(700), 17(700), 25(1900), 26(850), 41(2500) | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Network | GSM / HSPA / LTE | GSM / HSPA / LTE |
| SIM card | Nano-SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 4.0, A2DP | 5.0, A2DP, LE |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | Yes, with A-GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA 42.2/11.5 Mbps, LTE-A (2CA) Cat6 300/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A |
| USB | microUSB 2.0 | 2.0, Type-C 1.0 reversible connector |
| Camera | BLU S1 | Xiaomi Redmi Note 9 Pro |
| Main camera | 13 MP, Single | 48 MP, Quad |
| Specs | 13 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) |
| Features | LED flash | LED flash, HDR, panorama |
| Video | 1080p@30fps | 2160p@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS |
| Selfie camera | 5 MP, Single | 16 MP, Single |
| Multimedia | BLU S1 | Xiaomi Redmi Note 9 Pro |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio, recording |
| Design | BLU S1 | Xiaomi Redmi Note 9 Pro |
| Colors | Black, Gold | Aurora Blue, Glacier White, Interstellar Black |
| Dimensions | 147.3 x 72.8 x 8.4 mm | 165.8 x 76.7 x 8.8 mm |
| Weight | 137 g | 209 g |
| Body build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame | |
| Battery | BLU S1 | Xiaomi Redmi Note 9 Pro |
| Battery capacity | 2800 mAh, Non-removable Li-Po | 5020 mAh, Non-removable Li-Po |
| Battery life | Stand by time- Up to 600 h (2G) / Up to 550 h (3G) Talking time- Up to 24 h (2G) / Up to 16 h (3G) | |
| Other | BLU S1 | Xiaomi Redmi Note 9 Pro |
| Release date | 2017, September | 2020, March 12 |
| Sensors | Fingerprint (front-mounted), accelerometer, proximity, compass | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
