| Acer Liquid S1 |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| Operating system | Android 4.2 (Jelly Bean); Float UI | Android 10.0; MIUI 11 |
| Processor | Quad-core 1.5 GHz Cortex-A7 | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Mediatek MT6589 (28 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | PowerVR SGX544 | Adreno 618 |
| Internal memory | 8 GB, 1 GB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | microSD, up to 32 GB (dedicated slot) | microSDXC (dedicated slot) |
| Display | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| Type | TFT | IPS LCD |
| Size | 5.7" 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 | 66.2% | 84.5% |
| Display area | 89.6 cm2 | 107.4 cm2 |
| Display aspect ratio | 16:9 (height:width) | 20:9 (height:width) |
| Pixel Density | 258 PPI | 395 PPI |
| Colors | 16M | 16M |
| Other | 450 nits typ. brightness (advertised) | |
| Connectivity | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 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 | GSM / HSPA / LTE |
| SIM card | Single SIM (Micro-SIM)Dual SIM (Micro-SIM, dual stand-by) | Dual SIM (Nano-SIM, dual stand-by) |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | |
| Bluetooth | 4.0, A2DP, LE | 5.0, A2DP, LE |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) | |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | Yes, with A-GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA 42.2/5.76 Mbps | HSPA 42.2/5.76 Mbps, LTE-A |
| USB | microUSB 2.0 | 2.0, Type-C 1.0 reversible connector |
| Camera | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| Main camera | 8 MP, Single | 48 MP, Quad |
| Specs | 8 MP, AF | 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 | 2 MP, Single | 16 MP, Single |
| Multimedia | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio, recording |
| Design | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| Colors | White, Black | Aurora Blue, Glacier White, Interstellar Black |
| Dimensions | 163 x 83 x 9.6 mm | 165.8 x 76.7 x 8.8 mm |
| Weight | 195 g | 209 g |
| Body build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame | |
| Battery | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| Battery capacity | 2400 mAh, Removable Li-Po | 5020 mAh, Non-removable Li-Po |
| Battery life | Stand by time- Up to 450 h Talking time- Up to 11 h | |
| Other | Acer Liquid S1 | Xiaomi Redmi Note 9 Pro |
| SAR | SAR EU - 0.44 W/kg (head), 0.41 W/kg (body) | |
| Release date | 2013, June | 2020, March 12 |
| Sensors | Accelerometer, gyro, proximity, compass | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
