| Samsung Galaxy S II I777 |
Oppo A3s |
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| Hardware and OS | Samsung Galaxy S II I777 | Oppo A3s |
| Operating system | Android 2.3.4 (Gingerbread) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Dual-core 1.2 GHz Cortex-A9 | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Exynos 4210 Dual | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Mali-400MP4 | Adreno 506 |
| Internal memory | 16/32 GB, 1 GB RAM | 16 GB, 2 GB RAM |
| External memory | microSD, up to 32 GB (dedicated slot), 8 GB included | microSD, up to 256 GB (dedicated slot) |
| Display | Samsung Galaxy S II I777 | Oppo A3s |
| Type | Super AMOLED Plus | IPS LCD |
| Size | 4.3" inc | 6.2" inc |
| Resolution | 480 x 800 px | 720 x 1520 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Protection | Corning Gorilla Glass | |
| Screen-to-Body Ratio | 63.3% | 81.2% |
| Display area | 52.6 cm2 | 95.9 cm2 |
| Display aspect ratio | 5:3 (height:width) | 19:9 (height:width) |
| Pixel Density | 217 PPI | 271 PPI |
| Colors | 16M | 16M |
| Connectivity | Samsung Galaxy S II I777 | Oppo A3s |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 2100 | |
| 4G Network | LTE | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct, DLNA, hotspot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | GSM / HSPA | GSM / HSPA / LTE |
| SIM card | Mini-SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 3.0, A2DP, aptX | 4.2, A2DP, LE |
| Edge | Class 12 | Yes |
| GPRS | Class 12 | Yes |
| GPS | Yes, with A-GPS | Yes, with A-GPS |
| NFC | Optional | |
| Speed | HSPA 21.1/5.76 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | microUSB 2.0 (MHL TV-out), USB Host | microUSB 2.0, USB On-The-Go |
| Camera | Samsung Galaxy S II I777 | Oppo A3s |
| Main camera | 8 MP, Single | 13 MP, Dual |
| Specs | 8 MP, AF | 13 MP, f/2.2, AF -2 MP, f/2.4, depth sensor |
| Features | LED flash | LED flash, HDR, panorama |
| Video | 1080p@30fps | 1080p@30fps |
| Selfie camera | 2 MP, Single | 8 MP, Single |
| Multimedia | Samsung Galaxy S II I777 | Oppo A3s |
| 3.5 mm Jack | Yes | Yes |
| Radio | No | FM radio |
| Design | Samsung Galaxy S II I777 | Oppo A3s |
| Colors | Black | Red, Dark Purple |
| Dimensions | 126 x 66 x 8.9 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 121.9 g | 168 g |
| Battery | Samsung Galaxy S II I777 | Oppo A3s |
| Battery capacity | 1650 mAh, Removable Li-Ion | 4230 mAh, Non-removable Li-Ion |
| Battery life | Stand by time- Up to 400 h Talking time- Up to 8 h | |
| Other | Samsung Galaxy S II I777 | Oppo A3s |
| Release date | 2011, August | 2018, July |
| Sensors | Accelerometer, gyro, proximity, compass | Accelerometer, proximity, compass |
| SAR | SAR - 0.36 W/kg (head), 0.90 W/kg (body), SAR EU - 0.25 W/kg (head) |
