Koolnee Rainbow: Pros and Cons
Koolnee announced the launch of the Rainbow smartphone in 2018. The manufacturer is offering this smartphone with 5 inch IPS display, Mediatek MT6580A SoC, and 1 GB of RAM. The Rainbow comes with Android OS v8.1 (Oreo) pre-installed. This phone uses a high resolution 720 x 1280 px, 5 inch IPS display. This phone has only one rear-camera (8 MP, 3264 x 2448 px, autofocus) on its back for photos and videos. Is the cost justified by its features? I'll strive to answer that by the end of my review.
Table of Contents
- Koolnee Rainbow specifications
- Weight, dimensions, colors
- System, chipset, performance
- Display type, size, resolution
- Memory, storage
- Cameras, flash
- Connectivity, network, wireless
- Battery type, capacity, charger
- Features, sensors, specials
- Verdict, pros and cons
This article shares our personal experiences and thoughts about using the Koolnee Rainbow smartphone. We hope to offer helpful insights to others interested in this device. The specifications below are from the official manufacturer data, but we also consider user reviews. If you've seen any mistakes or things missing in these specifications, please let us know.
Koolnee Rainbow specifications
Brand | Koolnee |
---|---|
Name | Rainbow |
Model | RAINBOW |
Release date | 2018 |
Weight, dimensions, colors
Colors | black, blue, gold |
---|---|
SIM type | Nano SIM |
Smartphones use a Nano SIM as a subscriber identity module (SIM), which is a chip card.
System, chipset, performance
OS version | Android OS v8.1 (Oreo) |
---|---|
SoC | Mediatek MT6580A |
CPU | Quad-core 1.3 GHz Cortex-A7 |
GPU | Mali-400 MP2 |
The Koolnee Rainbow comes with Android OS v8.1 (Oreo) out of the box. Android is an open-source operating system. This means the source code is free to the public. The quad-core mobile CPU can provide fast and efficient performance for mobile games. Many people consider ARM Mali GPUs a good option for mobile devices.
Display type, size, resolution
Display type | IPS |
---|---|
Screen size | 5 inch |
Resolution | 720 x 1280 px |
Multitouch support | yes |
People know IPS for its wide viewing angles. It also has accurate color reproduction. The 5 inch display make this smartphone pocket-friendly. The display size is the diagonal distance from one corner of the screen to the opposite corner.
Memory, storage
RAM | 1 GB |
---|---|
Internal storage | 8 GB |
Memory card slot | microSD |
1 GB of RAM is not typically considered to be enough for a smartphone. Having more RAM alone does not guarantee better performance. If you use your smartphone for basic tasks like calling, texting, and browsing the web, 32GB may be sufficient for your needs. You can expand the internal storage of the Rainbow (8 GB) by using a compatible microSD card.
Cameras, flash
Main camera | 8 MP, 3264 x 2448 px, autofocus |
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Flash | LED |
Selfie camera | 5 MP |
You may have budget limits. Or, you may prioritize other features over a multi-camera system. If so, this single camera setup can be a good choice. The Rainbow does not have optical image stabilization (OIS).
Connectivity, network, wireless
GSM 2G bands | 850 / 900 / 1800 / 1900 |
---|---|
Network coverage | 2G / 3G |
Wi-Fi | Wi-Fi 802.11 b/g/n |
Bluetooth | v4.0, A2DP |
GPS | A-GPS |
NFC | no |
FM radio | yes |
USB | microUSB 2.0 |
Headphone | 3.5 mm jack |
Compared to modern 4G and 5G networks, 3G networks are much slower. The Rainbow supports the latest Wi-Fi standards. You can use Bluetooth to connect your Rainbow smartphone to many Bluetooth devices. The Rainbow has a GPS receiver. Many fitness and activity tracking apps rely on GPS. It is used to accurately measure and record outdoor activities. The phone isn't NFC (Near Field Communication) capable. NFC is not essential for basic phone functionality, but it can be useful. The 3.5 mm headphone jack allows you to connect wired headphones or earphones to the device.
Battery type, capacity, charger
Type | Li-Po 2400 mAh |
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The Li-Po 2400 mAh battery gives the smartphone a good battery backup. The lithium polymer (Li-Po) battery is a light-weight, rechargeable battery. You can simply buy a new battery from the open market and interchange it by yourself.
Features, sensors, specials
Sensors | accelerometer |
---|---|
Specials | Dual SIM |
Today, smartphones come with many sensors. They help make the user experience better. The accelerometer provides information about the smartphone's movement in three axes. These are X (horizontal), Y (vertical), and Z (depth). Dual SIM is great for businesses. They want to give staff a device with separate numbers and bills for personal and business use.
Verdict, pros and cons
Every phone has its strengths and weaknesses, and this Koolnee phone is no exception. As with any device, there are aspects that shine and others that fall short. By examining both sides, we can paint a complete picture of what this phone has to offer. Let's explore its standout features and areas for improvement. Remember, this is just my opinion, and yours might be different.
Pros
- microSD slot
- Dual SIM support
Cons
- limited-size screen
- insufficient memory
- insufficient internal storage
- single camera setup
- no OIS function
- no 4G support
- no 5G support
- no NFC feature
- no Type-C USB port
- low-capacity battery
- no digital compass
- no fingerprint reader
Please let us know if you find incorrect information or something isn't working. Also, tell us if you have a suggestion for improvement.