Overview of the Asus Zenfone 2 ZE551ML
The Asus Zenfone 2 ZE551ML was announced in January 2015 and released in March of the same year. Known for its balance between price and performance, this smartphone marked Asus's entry into the high-spec affordable smartphone market. It comes with specifications and features that, at the time of its release, were targeted to cater to tech-savvy consumers seeking power without breaking the bank.
Design and Build Quality
The Zenfone 2 sports a design typical of mid-2010s smartphones with its plastic frame and back, complemented by a glass front screen protected with Corning Gorilla Glass 3. The device measures 152.5 x 77.2 x 10.9 mm and weighs in at 170 grams, providing a substantial yet manageable form factor. The dual-SIM capability adds convenience for users wanting to separate work and personal lines.
Display
Equipped with a 5.5-inch IPS LCD, the Zenfone 2 offers a resolution of 1080 x 1920 pixels, achieving a pixel density of around 401 ppi. This results in crisp, clear visuals suitable for media consumption and browsing. The screen-to-body ratio is about 70.8%, integrating decently slim bezels for its time. The use of gorilla glass ensures durability against scratches and minor impacts.
Performance and Platform
The Zenfone 2 comes in two versions based on RAM and processor configuration. The model integrating 4 GB RAM houses an Intel Atom Z3580 chipset with a quad-core 2.3 GHz CPU, while the 2 GB RAM version includes an Intel Atom Z3560 with a quad-core 1.8 GHz CPU. Coupled with a PowerVR G6430 GPU across both variants, these specifications provide a snappy performance suitable for multitasking and moderate gaming scenarios. The device initially shipped with Android 5.0 Lollipop, upgradeable to Android 6.0 Marshmallow, offering considerable flexibility in terms of software updates during its prime years.
Memory and Storage
Memory options for the Zenfone 2 are quite extensive. It offers internal storage variants of 16GB, 32GB, 64GB, and 128GB, with RAM configurations of either 2GB or 4GB. Additionally, a dedicated microSDXC slot allows for expandable storage, ensuring users are not constrained by the internal memory. This is especially useful for users who require more space for apps, photos, and media files.
Camera Features
The Zenfone 2 features a 13 MP rear camera with an f/2.0 aperture, capable of capturing detailed images with good color reproduction under ample lighting. Its dual-LED dual-tone flash aids in low-light photography. It also supports panoramas and HDR functionalities. Video capture is supported at 1080p@30fps. The front houses a 5 MP camera with an f/2.0 aperture, fitting standard selfie and video calling requirements.
Connectivity Options
The device supports GSM, HSPA, and LTE bands, ensuring wide compatibility with global networks. It can achieve speeds of HSPA 42.2/5.76 Mbps and LTE Cat4 150/50 Mbps, maintaining reliable connectivity for most users. Additional connectivity features include Wi-Fi 802.11 a/b/g/n/ac, Bluetooth 4.0, NFC, and FM radio with RDS. The inclusion of microUSB 2.0 with OTG enhancements simplifies peripheral connectivity.
Battery and Charging
Powered by a non-removable 3000 mAh Li-Po battery, the Zenfone 2 supports 18W wired charging, advertised to charge the device to 60% in just 40 minutes. While the battery life was marketed with an endurance rating of 59 hours, actual performance can vary based on user habits and network conditions.
Additional Features
The Zenfone 2 comes equipped with several sensors, including an accelerometer, gyro, proximity sensor, and compass. The inclusion of a 3.5mm headphone jack addresses traditional audio needs. The sound quality, while decent, includes voice, noise, and ring dBs measurements rated at 62dB, 61dB, and 67dB respectively, ensuring clarity in calls and music playback.
Conclusion
Overall, the Asus Zenfone 2 ZE551ML established itself as a competitive player in the mid-range smartphone market of its time. Its blend of a robust feature set and affordable price, combined with Asus's commitment to software updates, made it a considerable choice for budget-conscious consumers seeking a reliable smartphone experience. Despite being discontinued, the Zenfone 2 still enjoys a nostalgic fanbase who appreciate its pioneering efforts in democratizing high-spec technology.
Key Features of Asus Zenfone 2 ZE551ML
- Supports multiple network technologies: GSM, HSPA, LTE
- IPS LCD display with a 5.5-inch screen and Full HD resolution
- Protected by Corning Gorilla Glass 3
- Powered by Intel Atom processors with options up to Quad-core 2.3 GHz
- Ample memory configurations with expandable microSDXC support
- 13 MP main camera with dual-LED dual-tone flash and HDR capabilities
- Features a 5 MP front camera for selfies
- Comes with a 3000 mAh battery supporting fast charging (60% in 40 min)
- Equipped with essential sensors: Accelerometer, gyro, proximity, compass
- Offers multiple color options: Osmium Black, Sheer Gold, Glacier Gray, Glamor Red, Ceramic White
Cons of Asus Zenfone 2 ZE551ML
- The device is discontinued, making it challenging to find spare parts or official support.
- It is relatively heavy, weighing 170 g, which could be uncomfortable for prolonged use.
- The build material includes a plastic back and frame, which may not be as durable or premium-feeling as metal or glass.
- The device was initially released with Android 5.0 and is only upgradable to Android 6.0, meaning it lacks newer Android features and security updates.
- Utilizes an Intel Atom processor, which may not be as efficient or powerful as newer chipsets, especially in demanding applications.
- The rear camera, while 13 MP, lacks advanced features found in more contemporary devices, such as image stabilization and high-quality low-light performance.
- The selfie camera is only 5 MP, which may not be sufficient for high-quality selfies compared to newer models.
- The phone uses a microUSB 2.0 port for charging and data transfer, rather than the newer USB-C standard.
- The battery is non-removable, which can complicate battery replacement in case of battery issues.
- Limited battery endurance with an official rating of 59 hours could result in frequent charging for heavy users.
- No water or dust resistance features, unlike many modern smartphones.
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