| Hardware and OS | E&L D57 | Oppo A3s |
| Operating system | | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | | Adreno 506 |
| Internal memory | | 16 GB, 2 GB RAM |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Hardware and OS E&L D57 | E&L D57 | Oppo A3s |
| Operating system | Android 9.0 Pie | |
| Processor | ARM Cortex-A53, 1300 MHz, Cores: 4 | |
| GPU | ARM Mali-T820 MP1, 680 MHz, Cores: 1 | |
| RAM | 1 GB | |
| Internal Storage | 8 GB | |
| Memory Card Slot | microSD, microSDHC, microSDXC | |
| User Interface | Yes | |
| Display | E&L D57 | Oppo A3s |
| Type | | IPS LCD |
| Size | | 6.2" inc |
| Resolution | | 720 x 1520 px |
| Touchscreen | | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | | 271 PPI |
| Colors | | 16M |
| Display E&L D57 | E&L D57 | Oppo A3s |
| Type | IPS | |
| Size | 6.18 inches | |
| Resolution | 480 x 996 pixels | |
| Colors | 16M | |
| Pixel Density | 195 ppi | |
| Touchscreen | Yes | |
| Protection | 2.5D curved glass screen | |
| Features | Capacitive, Multi-touch | |
| Connectivity | E&L D57 | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | | LTE |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | | Yes, with A-GPS |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | | microUSB 2.0, USB On-The-Go |
| Connectivity E&L D57 | E&L D57 | Oppo A3s |
| 4G Network | Yes | |
| Wi-Fi | b, g, n, Wi-Fi Hotspot | |
| GPS | GPS, A-GPS | |
| NFC | No | |
| USB | 2.0, Micro USB | |
| Speed | LTE 800 MHz LTE 850 MHz LTE 900 MHz LTE 1800 MHz LTE 2100 MHz LTE 2600 MHz LTE-TDD 2300 MHz (B40) | |
| SIM | Micro SIM | |
| Dual SIM | Micro-SIM | |
| Wireless Charging | No | |
| Camera E&L D57 | E&L D57 | Oppo A3s |
| Main camera | 6.18 inches | |
| Features | Dual LED | |
| Image | 2592 x 1944 pixels | |
| Selfie camera | 4.92 MP (megapixels) | |
| Camera | E&L D57 | Oppo A3s |
| Main camera | | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | | 8 MP, Single |
| Multimedia E&L D57 | E&L D57 | Oppo A3s |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Radio | Yes | |
| Video Playback | Yes | |
| Video Out | Yes | |
| Ring Tones | Yes | |
| 3.5 mm Jack | yes | |
| Multimedia | E&L D57 | Oppo A3s |
| 3.5 mm Jack | | Yes |
| Radio | | FM radio |
| Design | E&L D57 | Oppo A3s |
| Colors | | Red, Dark Purple |
| Dimensions | | 156.2 x 75.6 x 8.2 mm |
| Weight | | 168 g |
| Design E&L D57 | E&L D57 | Oppo A3s |
| Dimensions | 72 x 147 x 9.4 mm | |
| Waterproof | No | |
| Battery E&L D57 | E&L D57 | Oppo A3s |
| Capacity | 2520 mAh, Li-Polymer | |
| Battery | E&L D57 | Oppo A3s |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other E&L D57 | E&L D57 | Oppo A3s |
| Sensors | Proximity, Light, Accelerometer | |
| Other | E&L D57 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
