| Hardware and OS | NIU Niutek 3.5B | Oppo A3s |
| Operating system | Android 2.3 (Gingerbread) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | 1.0 GHz Cortex-A5 | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Spreadtrum SC6820 | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Mali-400 | Adreno 506 |
| Internal memory | 512 MB, 256 MB RAM | 16 GB, 2 GB RAM |
| External memory | microSD, up to 32 GB (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | NIU Niutek 3.5B | Oppo A3s |
| Type | TFT | IPS LCD |
| Size | 3.5" inc | 6.2" inc |
| Resolution | 320 x 480 px | 720 x 1520 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | 51.8% | 81.2% |
| Display area | 36.5 cm2 | 95.9 cm2 |
| Display aspect ratio | 3:2 (height:width) | 19:9 (height:width) |
| Pixel Density | 165 PPI | 271 PPI |
| Colors | 16M | 16M |
| Connectivity | NIU Niutek 3.5B | Oppo A3s |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual-band, hotspot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Network | GSM | GSM / HSPA / LTE |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| SIM card | Dual SIM (Mini-SIM) | Dual SIM (Nano-SIM, dual stand-by) |
| 4G Network | | LTE |
| Bluetooth | 3.0 | 4.2, A2DP, LE |
| Edge | Class 10 | Yes |
| GPRS | Up to 48 kbps | Yes |
| GPS | A-GPS only | Yes, with A-GPS |
| USB | microUSB 2.0 | microUSB 2.0, USB On-The-Go |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| Camera | NIU Niutek 3.5B | 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 |
| Video | @30fps | 1080p@30fps |
| Features | | LED flash, HDR, panorama |
| Selfie camera | | 8 MP, Single |
| Multimedia | NIU Niutek 3.5B | Oppo A3s |
| 3.5 mm Jack | Yes | Yes |
| Radio | Stereo FM radio, recording | FM radio |
| Design | NIU Niutek 3.5B | Oppo A3s |
| Colors | Black, White | Red, Dark Purple |
| Dimensions | 113.6 x 62 x 13.8 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 92 g | 168 g |
| Battery | NIU Niutek 3.5B | Oppo A3s |
| Battery capacity | 1300 mAh, Removable Li-Ion | 4230 mAh, Non-removable Li-Ion |
| Battery life | Stand by time- Up to 850 h
Talking time- Up to 17 h
| |
| Other | NIU Niutek 3.5B | Oppo A3s |
| Release date | 2013, March | 2018, July |
| Sensors | Accelerometer | Accelerometer, proximity, compass |
