No.1 F4 smart band real

No.1 F4 Smart Band Preview – China’s Best Waterproof Health Watch Under $20

Smartwatches and smart bands come and go, but only a few of them manage to make a long-lasting impact in the Chinese market. If you are among the people who prefer budget-friendly watch and want everything in a smartwatch, you might love the Chinese No.1 F4 Smart Band.

No.1 F4 Smart Band - feature

No.1 F4 Smart band is a perfect hybrid of health watch and smart watch. We can say that:

No.1 F4 smartwatch has everything that you can ever dream in a Chinese watch under $25

Let’s get into the details to know the smart band better:

No.F4 Durability Test – What Happens When You Freeze a No.1 F4 Smart Band?

The selling point of this smart band is probably its robustness as its IP 68 certified. Unisex means that it’s waterproof, shockproof, as well as dustproof. The watch can tolerate incredibly low temperatures and even it works after freezing. Here’s the video of the freezing test conducted on No.1 F4:

As you can see, the watch surprisingly passes the durability test. There’s no scratch nor any damage on the watch smart band which confirms that it’s not like other cheap Chinese watches and smart band under $25. The built quality is incredible, and you can rely on it despite the low price. Indeed, the Chinese No.1 F4 is not a one trick pony like most of the Chinese smart watches and bands.

Design & Display

No.1 breaks the trend in the F series by introducing F4 as a smart band instead of a smartwatch. A smaller screen size might be a problem in smart bands as they are rectangular instead of circular. However, the 0.96-inch OLED display is not that small considering a smart band. We think that the brightness is a bit lower but the screen is viewable under sunlight, though you might expect some reflection as well.

No.1 F4 Smart Band - screen

It occupies a space of 23.50 x 2.00 x 1.00 cm and weighs only 24 grams. The chassis is a plastic built apart from the glass screen. It’s a two colored strap that molds from TPU and is anti-allergic to the skin. The strap is 18mm wide and 235mm long, suitable on every Unisex wrist. The chassis is tightly sealed, and IP 68 certified so that it’s not only limited to splash resistance but underwater resistance as well.

No.1 F4 Smart Band - design

The watch is customizable like Mi Band 2 with different changeable straps as the chassis is detachable. You can get Mi Band 2 for a lower price but not with that much features and 24h dynamic HR monitor. Moreover, the screen is not capacitive. The only way you can swipe the menu is via the touch button at the bottom like in Mi Band 2. But, I guess that’s okay under $25.

No.1 F4 Smart Band - customizable

Hardware & Features

The No.1 F4 smart band integrates an NRF51822 sensor chip coupled with 16KB RAM and 256KB storage. Why won’t we need extra RAM as there’s no OS on the watch, no apps? The only thing that the watch relies upon is features, features, and more features. It can store data of a day in it, and you only have to synchronize it at the end of the day. It has a Bluetooth 4.0 module to connect and synchronize with smartphones.

We have categories features as there are too many, into sections. Heading to the health features first, we have:

  • A Pedometer along with mobile GPS trajectory support (accurate)
  • An infrared Heart rate sensor (MC3413-P)
  • Blood pressure measure (not accurate)
  • SpO2 (blood oxygen) measure (not accurate)
  • Calorie count (accurate)
  • Sleep Monitor (accurate)
  • Sedentary Reminder
No.1 F4 Smart Band – blood pressure
No.1 F4 Smart Band – O2 meter
No.1 F4 Smart Band – heart rate

In short, heart rate feature and other simple features are accurate, and you can rely on them but not in case of SpO2 and blood pressure meter. These things aren’t accurate like medical devices and are just for fun.

The environmental features include:

  • UV index (not that accurate)
  • Air pressure
  • Altimeter
  • Weather (synchronizes with the weather app on phone)

Also Read: LEAGOO KIICAA MIX Preview – Meet The World’s Cheapest Full-screen Phone

However, like most of the watches, we have the sports mode dedicated for exercises and sports like cycling, swimming, cardio, badminton, etc. The band shows real-time measurements all under one screen including HR, steps, calories, stopwatch.

Sports Mode on F4

No.1 F4 Smart Band - sport modes

The band is smart as it also supports:
  • Push messages and notifications
  • Incoming calls
  • GPS trajectory
  • Alarm
  • Remote camera

No.1 F4 Smart Band - clock screens

We also like to mention that the watch has an auto-lift screen feature, but like a budget-friendly watch, it has some short delays. Although it has a simple black and white UI it has eight different clock screens, analog and digital.

Battery & App Preview

No.1 F4 Smart Band is powered by a 130mAh Lithium-ion polymer battery. It may sound like the amperes are low, but the capacity is enough to run the band for 5 – 10 days, depending on how frequent you use. Only 2 hours of complete charging can give the user a standby up to a week. It can be charged via magnetic/adsorption charging via USB cable given in the packaging. Don’t lose it as it’s too hard to get a new one.

No.1 F4 Smart Band - charger

Now coming to the point, No.1 F4 has a dedicated app named “Fitness Bracelet” with the No.1 logo. It’s a multi-language app, but like most of the Chinese health apps, it’s not that good. It has some bugs and disconnects with some devices. The Chinese developers do some fixes regularly. Once the band is connected to the app, you can set goals, view health record (day, week, month, and year). The sleep monitor starts at midnight. Only if they add the manual sleep to wake up function, colored graphs, the app could become a lot better.

No.1 F4 Smart Band – App
No.1 F4 Smart Band – App 1
No.1 F4 Smart Band – App 2
No.1 F4 Smart Band – App 3
No.1 F4 Smart Band – App 4
No.1 F4 Smart Band – App 5
No.1 F4 Smart Band – App 6
No.1 F4 Smart Band – App 7
No.1 F4 Smart Band – App 8

The UI is the simplest we have ever seen in any Chinese wearable app. You can set the app notification, heart rate alert, a sedentary reminder and more. You can scan and install an app via QR code given at the back of the band.

Specification Sheet

Dimension23.50 x 2.00 x 1.00 cm
Weight24 grams
Materialplastic, glass
Band23.5 x 1.8 cm
Band materialTPU
FeaturesBluetooth calling: Caller's name display,Phone call reminder
Health tracker: Heart rate monitor,Pedometer,Sedentary reminder,Sleep monitor
Remote control function: Remote Camera
Notification type: Facebook,Skype,Twitter,Wechat,WhatsApp
Alert type: Vibration
ScreenOLED 0.96-inch
BatteryType of battery: Lithium-ion polymer battery
Battery Capacity: 130mAh
Charging Time: About 2hours
Standby time: 7 - 10 days
App Compatibility Compatible OS: Android,IOS
Compatability: Android 4.4 or above and iOS 9.0 or above
Language: English,Simplified Chinese
Contents1 x Smartband, 1 x USB Cable, 1 x English-Chinese Manual

Pros & Cons


  • IP 68 certified
  • Numerous features
  • Durable and great built
  • Changeable straps
  • Budget Friendly Price


  • Poor App support
  • Some functions are not accurate

Our Verdict

The smart band is a great deal under $25. It’s durable, offers incredible features, though some are just for fun (not accurate) such blood pressure meter. The band is elegant with the two colored removable and replaceable strap. It’s not worthy to be called a true smart watch as there’s no voice recognization, and Android wear. But as a simple health watch under a tight budget, it’s worthy of giving a shot.

Price & Availability

If you are interested in purchasing No.1 F4 smart band, you can get it in four colors: red, blue, green, gray for a price $24.96 on Gearbest. Still, you can get it at a discounted price $19.99 by applying the limited coupon code:


No.1 F4 smart band coupon price

Here’s the link to the stores:

  1. This smartband is not very smart!!!
    I have latest ver of app Fundo Pro v.1.2.2, Smartband F4 with firmware v.0.1.8, Smartphone Sony Xperia Z2, android 6.0.1.
    Smartband bugs/issues:
    – not working Outdoor and Weather funktions
    – is not possible to check alarm set on smartmand
    – is not possible to check % of battery
    – is not possible to lock display (or touch key) = when You run sweat clothing touching smartband stops/reset all data…. Same happen by swimming
    – is not very accurate to measure Heart rate while running, it count just 1/2 of heart beats (it shows 70, while I have 140 BPM), HRM is accurate only by resting
    – is not possible to find steps info in smartband, only if you set DIAL
    – is not possible to set vibrating of smartband, while it get out of reach of smartphone bloetooth signal
    – step counter algorhytm is inacurate. I drive 300km with car, it count 5000 steps!!!
    – EVERY MITHNIGHT smartband reset data of previus day and VIBRATE = wake me UP!!!!!
    Application bugs:
    – everyday lost data of step counter of previous days
    – sleep monitor shows no data
    – sync is not working too
    – is not possible to store data to any server/cloud
    – when you set period of heart rate monitoring, no data is stored in app
    – when you get out of reach, bluetooth connection losts, is hard to reconect, only helped unbind and bind bracelet again.
    – many others ?

    1. Hi there! Yes. Some of the smartphones are not compatible with the Fundo App, especially the Sony Xperia lineup. Have you tried using it on any other phone? Let’s hope the developers provide the fixes soon.

  2. You said that like most of the watches we have sports like cycling, swimming, cardio, badminton etc. I really can’t find swimming mode. And any idea how we go back in the menu?

    1. There’s a swimming mode in the training menu you see on the start menu. As far as the operations are concerned, short touch to swipe through menus. Long touch (2 to 4 secs) to enter a menu. Long touch (2 to 4 secs) to go back to the previous menu, like while reading messages long press to go back to home menu.

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