The Haylou is one of the many sub-brands of the Chinese giant Xiaomi‘s ecosystem and the best producers of smartwatches and headphones are back with a new upgrade for the Haylou RS Series called the Haylou RS4, This new upgrade gives the smartwatch an improved look with better hardware, and features. It’s equipped with a 1.78-inch AMOLED screen, there is also customization of watch faces, heart rate monitoring, Blood pressure, IP68 Waterproof, and 12 Multi-Sport Modes, all of this you get with stylish design at a price average-cost is no more than $65. So let’s take a look at how it performs, and whether it is worth buying.


Haylou RS4 Smartwatch Features

  • 1.78 inch AMOLED Display
  • Customize Watch Faces
  • Bluetooth Version 5.1 / NFC
  • Heart Rate and Blood Pressure Monitor
  • 12 Multi-Sport Modes
  • 230mAh Battery
  • IP68 Waterproof

Design And Build Quality

Unlike Haylou RS3 with a round body, The Haylou RS4 smartwatch has a square design that looks very clean and elegant in black suitable for both men and women and features a smooth 2D curved glass in a metal frame with a brushed finish, giving it the look of an expensive watch, and it really is, And it has one button that turns on-off and the menu. Overall, the body is slim and light and made of high-quality aluminum alloy which makes it lightweight at just 48.6 grams and therefore comfortable on the wrist.

If you look at the back, there’s nothing out of the ordinary, just a plastic cover with magnetic charging pins and a heart rate sensor.


The strap on the RS4 smartwatch is made of silicone, lightweight and comfortable on your wrist for long-lasting use. You can use any 20mm strap because it’s removable and available in black color but you can buy another strap from metal or leather separately.


Display Screen

The screen in Haylou RS4 Smartwatch is my favorite type and one of the strengths of this smartwatch, it has been upgraded from a normal TFT panel to an AMOLED panel with 1.78 inches and 2.5D curved to display better content and details, and because it has a resolution of 320*385 pixels with a high refresh rate. This is what makes it one of the best screens in a budget smartwatch in terms of size and resolution, even the sharpness of colors and brightness are so good, especially when you wear them in the sunlight you won’t be alarmed by them.

In fact, the reason to make this type of screen my favorite, because this screen is large and takes over most of the interface, and with narrow sides, and this is only found in smartwatches with higher costs. This is in contrast to other inexpensive smartwatches that contain a touch screen, which comes in the middle of the screen and has rather wide sides.

Haylou RS4 Watch faces

If you are tired of the system default dial background, Haylou RS4 Smartwatch has 5 pre-installed watch faces, you can switch between them easily by long pressing on the home screen or via the Haylou Fun app for more watch faces with over 40 online watch faces are available for download with customization capabilities for a variety of colors, retro, analog, 3D, and digital faces or your own photos as a watch face background or any wallpaper. And with the wrist-raised feature to wake up the screen, that would be great.


With IP68 waterproof in Haylou RS4 Smartwatch, It means you can wear it while washing hands or on rainy days, although the watch is not approved for swimming but is good for wearing for activities, so, I do not recommend swimming or exposing it to hot water or saltwater to avoid any harm Long or short term, however, if it’s exposed to water in any way, I prefer to dry the watch after immersing it in water and before operating it so that it stays with you for as long as possible.


Under The Hood

When it comes to performance, Haylou RS4 Smartwatch adopts the built-in chip for faster response speed and faster data processing, For your health, this device has a Low-power dynamic optical heart rate sensor, so this wearable device manages your motion every moment and takes good care of you throughout the day.


Also, has Bluetooth 5.1 for more fast and stable transmission and reception of the signal. And this version is compatible with Android 6.0 and later or iOS 11.0 and above so that the connection is through the Haylou Fun app. In mainland China, the NFC sensor of RS4 can support Alipay scan code payments. However, the global NFC function may only be able to unlock the smart lock.

Haylou RS4 Health & Fitness Functions

The Haylou RS4 Smartwatch is equipped with 12 multi-sports modes to suit any of your needs, including Fast walking, Climbing, Spinning, Yoga, Indoor Running, Gymnastics, Basketball, Football, Rowing, Cycling.

Apart from the sports features, RS4 built-in four optical heart rate sensors, with a professional intelligent heart rate algorithm, you can monitor your heart rate in real-time to check whether it’s beating normally or not and monitor sleep to measure your total light sleep, deep sleep, and wake time to provide you with an analysis of your sleep patterns, monitor blood pressure and measure oxygen levels in the blood in real-time to improve for the ability of the cardiovascular system to prevent the low level of oxygen in the blood that causes discomfort to a person’s body.

Although it has a good sensor that is more accurate than other sensors, this does not mean that the measurements provided by this smartwatch are completely accurate, as most of them are largely unreliable because it’s not a medical instrument, but it makes you very aware of your health and physical performance. unfortunately, this is often the case with watches in this price range.

Haylou Fun App For Haylou RS4 Smartwatch

Haylou RS4 Smartwatch is compatible with the Haylou Fun app for Android and iOS to help you set up and use the watch more efficiently. Unfortunately, it is not the best and does not compare with Samsung / Amazfit or Huawei apps neither in terms of appearance or even language, except that it contains the basic functions that fit this watch with a rather smooth performance.

After logging into the application and selecting the RS4 device, the watch is connected to the application, and then we can select our profile (gender, age, weight, height) in order to make the correct measurements, and on the main screen, You can take advantage of some features, stats, and functions without any additional equipment, such as steps taken, sleep hours, heart rate measurements that you have taken, and all this is done by automatically integrating watch data on the home screen with the ability to view it on a daily or monthly basis. Also set exercise goals and encourage yourself to complete your exercise amount each day through a simple and easy-to-understand operating interface.

The app is downloaded through the Google Play Store or the Apple App Store, so you know it is a safe app.

And on the same application, we will be able to customize the watch face to our liking, choose apps to receive notifications from them, stable alarms, and control the music on your mobile phone directly from the watch or even take pictures, although these have become standard features in many smartwatches of late.

How To Pair The Haylou RS4 To a Smartphone

It’s easy to connect the Haylou RS4 smartwatch to your phone. After installing the Haylou Fun app, all you have to do is add a device by scanning the QR code of the smartwatch, and the phone will search and find the watch in seconds. In doing so, you will communicate directly and without any complications, with automatic adjustment of time, language, and weather, as well the feature of dial-up, and update the smartwatch software if available.


Notifications are clearly visible and easily readable. You can choose lots of different popular apps to give notifications on Haylou RS4 Smartwatch, for example, WhatsApp, Twitter, Facebook, Instagram, SMS, WeChat, and other apps are supported.


For messages, it is not possible to interact together, and if the message is too large, only part of it can be viewed, and obviously, we can’t see the images. The notification message will keep the last eight messages on the watch, if you miss it a bit, you can also review it.

Haylou RS4 Battery Life & Charging Time

In the end, The battery size on the Haylou RS4 is something that is considered somewhat positive, as you get 230 mAh which gives you up to 15 days of battery life. but this is done with the reduced operation of the heart monitor, turning off notifications, and other features. In any case, RS4 guarantees us at least 7 days for heavy use with heart rate monitoring and notifications turned on, and it will charge through the magnetic charger in about 2 hours.



Let’s agree that some of us think the price of the smartwatch is a bit high, but if an AMOLED screen is important to you then you will definitely enjoy it, even there is a really amazing IP68 water resistance, with these specifications you won’t find In any budget smartwatch, the price will naturally be this high, so if you want to buy a smartwatch that is sporty and elegant, the Haylou RS4 is worth recommending.


Haylou RS4 Smartwatch Price And Where To Buy

The Haylou RS4 Smartwatch is currently available on the Aliexpress Store for a very good price So, don’t miss out on this great deal. And to view its price or buy it, you can access the offer by clicking on the store icon.


Package content

  • Haylou RS4 Smartwatch
  • Magnetic charger
  • User Manual

Haylou RS4 Smartwatch Specifications

ModelHaylou RS4
Bluetooth VersionBT v5.1
Compatible SystemAndroid system 6.0 version or above; iOS system 11.0 version or above
Operating ModeFull Touch
APP NameHaylou Fun
WaterproofATM 5 
Personalized DialMulti-Dials
SensorLow-power dynamic optical heart  rate sensor, acceleration sensor, Sony GPS
Sport ModesJogging, Fast walking, Biking, Climbing, Spinning, Yoga, Indoor running, Integrated training, Gymnastics, Basketball, Football, Rowing, Open water swimming, Swimming pool.
ScreenSize: 1.78 inch
Resolution: 368*448
MaterialBand Material: Silicone 
Watch Case Material: aluminum alloy
BatteryBattery Capacity: 230mAh 
Standby Time: about 30 days
Using time: About 5-7 days
Charging Time: About 1-2 hours 
Charging Method: Magnetic
SizeSize: about 45.2*37.2*11.1
Strap Size: 20mm
Weight: 48.6g