| Hardware and OS | Asus ROG Phone II ZS660KL | Oppo A3s |
| Operating system | Android 9.0 (Pie), ROG UI | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core (1x2.96 GHz Kryo 485 & 3x2.42 GHz Kryo 485 & 4x1.78 GHz Kryo 485) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Qualcomm SM8150 Snapdragon 855 (7 nm) | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Adreno 640 (700 MHz) | Adreno 506 |
| Internal memory | 128GB 8GB RAM, 256GB 12GB RAM, 512GB 12GB RAM, 1TB 12GB RAM | 16 GB, 2 GB RAM |
| External memory | No | microSD, up to 256 GB (dedicated slot) |
| Display | Asus ROG Phone II ZS660KL | Oppo A3s |
| Type | AMOLED capacitive touchscreen, 16M colors | IPS LCD |
| Size | 6.59 inches, 106.6 cm2 | 6.2" inc |
| Resolution | 1080 x 2340 pixels, 19.5:9 ratio | 720 x 1520 px |
| Touchscreen | | capacitive touchscreen |
| Protection | Corning Gorilla Glass 6 | |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | | 271 PPI |
| Colors | | 16M |
| Main Camera | Asus ROG Phone II ZS660KL | Oppo A3s |
| Camera | 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8?m, PDAF, Laser AF
13 MP, f/2.4, 11mm (ultrawide) | |
| Features | LED flash, HDR, panorama | |
| Video | 2160p@30/60fps, 1080p@30/60/240fps, 720p@480fps; gyro-EIS (except @240/480fps) | |
| Selfie camera | Asus ROG Phone II ZS660KL | Oppo A3s |
| Camera | 24MP, f/2.2, 0.9?m | |
| Features | Panorama, HDR | |
| Video | 1080p@30fps | |
| Connectivity | Asus ROG Phone II ZS660KL | Oppo A3s |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 13(700), 17(700), 18(800), 19(800), 20(800), 28(700), 29(700), 32(1500), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500), 46(5200) | 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 | 5.0, A2DP, LE, aptX HD | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| NFC | Yes | |
| GPS | Yes, with dual-band A-GPS, GLONASS, BDS, GALILEO, QZSS | Yes, with A-GPS |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (5CA) Cat18 (Cat20 Ultimate edition) 1200/150 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| Technology | GSM / HSPA / LTE | |
| USB | 3.1, Type-C 1.0 reversible connector; accessory connector | microUSB 2.0, USB On-The-Go |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/ad, dual-band, Wi-Fi Direct, hotspot | |
| Camera | Asus ROG Phone II ZS660KL | 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 | Asus ROG Phone II ZS660KL | Oppo A3s |
| Loudspeaker | Yes, with DTS:X stereo speakers (2 dedicated amplifiers) | |
| Multimedia | 24-bit/192kHz audio | |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio |
| Design | Asus ROG Phone II ZS660KL | Oppo A3s |
| Body build | Glass front (Gorilla Glass 6), glass back (Gorilla Glass 3), aluminum frame | |
| Colors | Matte Black, Glossy Black | Red, Dark Purple |
| Dimensions | 171 x 77.6 x 9.5 mm (6.73 x 3.06 x 0.37 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 240 g (8.47 oz) | 168 g |
| SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Battery | Asus ROG Phone II ZS660KL | Oppo A3s |
| Capacity | Non-removable Li-Po 6000 mAh battery | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Features | Asus ROG Phone II ZS660KL | Oppo A3s |
| Sensors | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass | |
| Other | Asus ROG Phone II ZS660KL | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
