| Hardware and OS | Celkon A66 | Oppo A3s |
| Operating system | Android 4.1.2 (Jelly Bean) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Dual-core 1.2 GHz | Octa-core 1.8 GHz Cortex-A53 |
| Internal memory | 4 GB, 512 MB RAM | 16 GB, 2 GB RAM |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| External memory | microSD, up to 32 GB | microSD, up to 256 GB (dedicated slot) |
| GPU | | Adreno 506 |
| Display | Celkon A66 | Oppo A3s |
| Type | TFT | IPS LCD |
| Size | 4.5" inc | 6.2" inc |
| Resolution | 480 x 854 px | 720 x 1520 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | 61.1% | 81.2% |
| Display area | 55.8 cm2 | 95.9 cm2 |
| Display aspect ratio | 16:9 (height:width) | 19:9 (height:width) |
| Pixel Density | 218 PPI | 271 PPI |
| Colors | | 16M |
| Connectivity | Celkon A66 | Oppo A3s |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | GSM | GSM / HSPA / LTE |
| SIM card | Dual SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 2.0 | 4.2, A2DP, LE |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Edge | Yes | Yes |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| GPRS | Yes | Yes |
| 4G Network | | LTE |
| GPS | Yes | Yes, with A-GPS |
| USB | microUSB | microUSB 2.0, USB On-The-Go |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| Camera | Celkon A66 | Oppo A3s |
| Main camera | 3.15 MP, Single | 13 MP, Dual |
| Specs | 3.15 MP | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | LED flash | LED flash, HDR, panorama |
| Video | Yes | 1080p@30fps |
| Selfie camera | 0.3 MP, Single | 8 MP, Single |
| Multimedia | Celkon A66 | Oppo A3s |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio |
| Design | Celkon A66 | Oppo A3s |
| Colors | White, Black | Red, Dark Purple |
| Dimensions | 136 x 67.2 x 11 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 98 g | 168 g |
| Battery | Celkon A66 | Oppo A3s |
| Battery life | Stand by time- Up to 160 h
Talking time- Up to 5 h
| |
| Battery capacity | 2000 mAh, Li-Ion | 4230 mAh, Non-removable Li-Ion |
| Other | Celkon A66 | Oppo A3s |
| SAR | SAR EU - 0.38 W/kg (head), 0.47 W/kg (body) | |
| Release date | 2014 | 2018, July |
| Sensors | Accelerometer, proximity | Accelerometer, proximity, compass |
