| Local Name | Zenfone 4 Pro ZS551KL |
| Technology | GSM / HSPA / LTE |
| 4G Bands | 1, 2, 3, 4, 5, 7, 8, 17, 19, 20, 28, 38, 39, 40, 41 - Global, Taiwan | 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 29, 30, 38, 39, 41 - US, Canada, Brazil | 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 29, 30, 38, 39, 40, 41 - India |
| 3G Bands | HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (3CA) Cat12 600/150 or 100 Mbps |
| Announced | 2017, August |
| Status | Available. Released 2017, October |
| Dimensions | 156.9 x 75.6 x 7.6 mm (6.18 x 2.98 x 0.30 in) |
| Weight | 175 g (6.17 oz) |
| Build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame |
| SIM | Hybrid Dual SIM (Nano-SIM, dual stand-by) |
| Display Type | Li-Ion 3600 mAh, non-removable |
| Screen Size | 5.5 inches, 83.4 cm2 (~70.3% screen-to-body ratio) |
| Resolution | 1080 x 1920 pixels, 16:9 ratio (~401 ppi density) |
| Protection | Corning Gorilla Glass 5 |
| OS | Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4 |
| Chipset | Qualcomm MSM8998 Snapdragon 835 (10 nm) |
| CPU | Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo) |
| GPU | Adreno 540 |
| Card Slot | microSDXC (uses shared SIM slot) |
| Internal Memory | 64GB 6GB RAM, 128GB 6GB RAM |
| Camera Features | HDR |
| Video | 1080p@30fps |
| Loudspeaker | Yes, dual speakers |
| 3.5mm Jack | Yes |
| Sound | 24-bit/192kHz audio |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct |
| Bluetooth | 5.0, A2DP, EDR, LE, aptX |
| NFC | Yes |
| Infrared Port | Yes |
| Radio | FM radio |
| USB | USB Type-C 2.0, OTG |
| Sensors | Fingerprint (front-mounted), accelerometer, gyro, proximity, compass, color spectrum |
| Talk Time | Up to 27 h 30 min (3G) |
| Colors | Moonlight white, Pure Black |
