In depth comparison and review of ASUS ZenFone Zoom (ZX551ML) and Xiaomi Redmi S2. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.
| DESIGN AND DIMENSIONS | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | ZX551ML | - | |
| Form Factor | Touch | Touch | |
| Height | 158.9 mm | 160.73 mm | Xiaomi Redmi S2 has greater height than ASUS ZenFone Zoom (ZX551ML). |
| Width | 78.8 mm | 77.26 mm | ASUS ZenFone Zoom (ZX551ML) has greater width than Xiaomi Redmi S2. |
| Depth | 12 mm | 8.1 mm | Xiaomi Redmi S2 is narrower than ASUS ZenFone Zoom (ZX551ML). |
| Weight | 185 g | 170 g | Xiaomi Redmi S2 is lighter than ASUS ZenFone Zoom (ZX551ML). |
| Body Colour | Ceramic white | Pure black | Grey | Blue | Rose gold | Gold | Black | Dark grey | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 0.432 W/kg (body), 0.343 W/kg (head) | 1.577 W/kg (body), 0.429 W/kg (head) | |
| Connector Type | Headset jack - mini-phone 3.5mm Micro-USB - 5 pin Micro-USB Type B |
Micro-USB - 5 pin Micro-USB Type B Headset jack - mini-phone 3.5mm |
|
| SIM Card Type (Size) | Micro SIM | Nano SIM | |
| SIM Card Qty | - | Dual-SIM |
| DISPLAY | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Display Type | LCD display | LCD display | |
|---|---|---|---|
| Display Technology | IPS | - | |
| Screen Size (Display Size) | 5.5" | 5.99" | Xiaomi Redmi S2 has larger screen size than ASUS ZenFone Zoom (ZX551ML). |
| Screen Resolution (Display Resolution) | 1920 x 1080 pixels | 1440 x 720 pixels | ASUS ZenFone Zoom (ZX551ML) has better screen resolution than Xiaomi Redmi S2. |
| Display Format | Full HD | HD+ | |
| Pixel Density | 401 ppi | 269 ppi | ASUS ZenFone Zoom (ZX551ML) has better pixel density than Xiaomi Redmi S2. |
| Aspect Ratio | - | 18:9 | |
| Max Brightness | - | 450 cd/m² | |
| Colour Depth | 16.7 million colours | 16.7 million colours | Both phones have the same color depth. |
| Contrast Ratio | - | 1000:1 | |
| Display Features | - | Night Display, Sunlight Display, Reading mode, Colour temperature adjustment | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 4 (scratch resistant glass) | - |
| PROCESSOR | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Processor Type (CPU) | Intel Atom | Qualcomm Snapdragon 625 | |
|---|---|---|---|
| Processor Number | Z3590 | - | |
| Clock Speed | 2.5 GHz | - | |
| Processor Core Qty | Quad-core | 8-core | Xiaomi Redmi S2 has higher processor core quantity than ASUS ZenFone Zoom (ZX551ML). |
| 64-bit Architecture | - | Yes | Xiaomi Redmi S2 has 64-bit architecture. |
| Graphics System (GPU) | PowerVR G6430 | Qualcomm ADRENO 506 |
| MEMORY | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| RAM | 4 GB | 3 GB | ASUS ZenFone Zoom (ZX551ML) has more RAM than Xiaomi Redmi S2. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 32 GB | Both phones have the same internal memory capacity. |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 128 GB | microSDHC, microSDXC - up to 256 GB |
| CAMERA | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 1 | 2 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 12 Megapixel | ASUS ZenFone Zoom (ZX551ML) has better camera resolution than Xiaomi Redmi S2. |
| Lens Aperture | F/2.7-4.8 | F/2.2 | Xiaomi Redmi S2 has better lens aperture than ASUS ZenFone Zoom (ZX551ML). |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | - | ASUS ZenFone Zoom (ZX551ML) has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | Yes | - | |
| Digital Zoom | 3x | - | |
| Special Effects | - | HDR, low light enhancement | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | Panorama | Panorama, portrait mode, AI portrait mode | |
| Face Recognition (Face ID) | Face detection | Face recognition | Both phones have face detection. |
| Light Source | Dual LED flash | LED flash | |
| Video Resolutions | 1920 x 1080 (1080p) | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps | |
| Camera Features (Functions) | - | Phase Detect Auto-Focus (PDAF), AI Dual camera |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | - | 5 Megapixel |
|---|
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 5 Megapixel | 16 Megapixel | Xiaomi Redmi S2 has better front camera resolution than ASUS ZenFone Zoom (ZX551ML). |
| Lens Type (Front) | - | Wide-angle lens | |
| Lens Aperture (Front) | F/2.0 | F/2.0 | Both phones have the same front camera lens aperture. |
| Special Effects (Front) | - | Precise bokeh effect, AI Beautify 4.0 | |
| HDR Mode (Front) | - | Auto HDR mode | |
| Camera Modes (Front) | - | Wide selfie mode | |
| Light Source (Front) | - | LED flash |
| BATTERY AND CHARGING | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Battery Capacity (Battery Size) | 3000 mAh | 3080 mAh | Xiaomi Redmi S2 has larger battery capacity than ASUS ZenFone Zoom (ZX551ML). |
|---|---|---|---|
| Battery Technology | Lithium polymer | - |
| CELLULAR | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 4G | Both phones have the same mobile network generation. |
| Operating System | Android 5.0 (Lollipop) | - | |
| User Interface | ASUS ZenUI 2.0 | MIUI 9 | |
| Navigation | A-GPS, GLONASS, BeiDou | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE | GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE, FDD-LTE, TDD-LTE | |
|---|---|---|---|
| 2G Band | 850 GSM, 1800 GSM, 1900 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | - | Band 1, Band 2, Band 5, Band 8 | |
| 3G UMTS Frequency | - | 2100, 1900, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 5, Band 7, Band 8, Band 9, Band 18, Band 19, Band 28 | Band 1, Band 3, Band 4, Band 5, Band 7, Band 8, Band 20, Band 38, Band 40 | |
| 4G LTE Frequency | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 850, FDD 2600, FDD 900, FDD 1800, FDD 800 lower, FDD 800 upper, FDD 700 APT | FDD 2100, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 800 DD, TDD 2600, TDD 2300 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | Infrared (IrDA), IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 4.0 | Bluetooth 4.2 | |
| Bluetooth Profiles | A2DP | - | |
| NFC | Yes | - | ASUS ZenFone Zoom (ZX551ML) has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | SMS, MMS |
| MEDIA | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Supported Digital Audio Standards | - | WAV, AAC, PCM, MP3, FLAC, AAC +, eAAC+, APE (Monkey's Audio), DSD, AMR-WB, AMR-NB | |
|---|---|---|---|
| Supported Digital Video Standards | - | VC-1, XviD, MPEG-4, H.264, M4V, HEVC, H.265, ASP |
| FEATURES | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Phone Functions | Speakerphone, call timer, conference call, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, proximity sensor, digital compass, gyro sensor | Accelerometer, ambient light sensor, proximity sensor, digital compass, gyro sensor | |
| Security Devices | - | Face recognition, fingerprint reader | |
| Additional Phone Features | Multitasking | Infrared remote control, Dual microphones |
| OTHERS | ASUS ZenFone Zoom (ZX551ML) | Xiaomi Redmi S2 |
|---|
| Included Accessories | Power adapter | USB cable, power adapter, SIM card removal tool, clear soft case |
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