Winter Clearance Sale


Mouse over to zoom in

K21 1.3-Inch IPS Screen Smart Watch Sports Watch

K21 1.3-Inch IPS Screen Smart Watch Sports Watch

BT5.0 Fitness Tracker IP68 Waterproof Sleep/Heart Rate/Blood Pressure/Temperature Monitor Pedometer Multiple Sports Mode Notification/Call/Sedentary Reminder Remote Camera Compatible with Android iOS Black

Price on the app only:

Already have TOMTOP APP

Scan the product's code to buy directly!

Note: Please update TOMTOP App to the latest version.


Download freely and enjoy extra offers!

Ship From:
  • China Warehouse
Please select a warehouse
Usually will be shipped in business days hours
The request failed! Please try again.
Sorry, it seems that there are no available shipping methods for your location.Please contact us for further assistance.


Ship to

United States
Stock in: china


Please select a color

For each user order no more 5 item(s)

Special discount has ended

Please note each user for only 1 item(s)

Preorder Add To Cart Out of Stock

Arrival Notice

if the goods arrival in 90 days,we will inform you by email!


Arrival Notice

Notification Subscription Success!

if the goods arrival in 90 days,we will inform you by email!

Notification Subscription Failed!

Error appeared,Please try again later!

Arrival Notice

Buyer Protection

  • Full Refund If you don't receive your order
  • Full or Partial Refund , If the item is not as described Learn More >
[Health Monitor]
Automatically and accurately monitor and analyze your heart rate,blood pressure and blood oxygen.Let you know your health condition at any time and anywhere.
[Thermometer Monitor]With built-in thermometer sensor,the watch can check temperature at any moment by raising up the hand.
[Sleep Monitor]This watch will automatically turn on from 9:30PM to 12:00AM.Record your sleep duration and then analyze your sleep quality.Help you adjust the rest time for a better sleep quality.
[Multiple Workout Modes] 8 kinds of sport modes are offered to you,such as running,walking,climbing,riding and so on,meeting your different exercise needs.
[Smart Reminder]When connected with your phone,this watch can provide synchronous display of all social messages,such as SMS,Facebook,What's app Wechat and so on.It also offers incoming calls reminder and sedentary reminder.
[IP68 Waterproof] Can be worn while swimming washing hand or in rain.Help you dealing with daily water activities easily.
[More Functions] Steps,Calories,Distance,Alarm Clock,Drinking water reminder,Medication reminder,Meeting reminder,Remote camera, Timer, Stopwatch, Countdown, Find my phone after connecting app,Don't disturb,Raise your wrist to light up screen.

Screen Size:1.3 inches
Compatibility:Android 4.4 and above or iOS 8.2 and above
Battery Type:Rechargeable lithium battery
Battery Capacity:230mAh
Memory:521KB(Flash 64MB)
Standby Time:About 30 days
Working Time:5-7days
App:F Fit

Water-Resistant Level:IP68
Dial Size:45mm/1.8in
Dial Thickness:10.8mm/0.4in
Item Weight:43g/1.5oz
Package Size:10.1*8.6*5cm/4*3.4*2in
Package Weight:68g/2.4oz

Connect BT:Please power on your phone BT and turn on smart watch BT before connecting.
Please ensure your smart watch did not connect with other phone before connecting.
Please keep close to your smart watch when you are connecting.
Please turn on mobile phone notifications and allow permissions to run in the background if your mobile has installed "Mobile manager" or other similar Apps, otherwise you will not receive the messages.
Battery Recharge: Power adaptor:5V 0.5-1A If the bracelet won't be used for long period,please ensure a full charging every month and turn it off after getting full charged.
To ensure the accuracy of blood pressure data, please hold the smart band at the same height as your heart,relax yourself and calm down.Do not talk when the monitor is working.(this function is to monitor the blood pressure data change before & after exercise. The data are only for reference,can't be used for special medical purpose)

Package List:
1*Smart Watch
1*Charging Cable 
1*User Manual

Questions & Answers

  • Q (K21 Smart Watch) Please let me know if the blood pressure and blood oxygenation are measured automatically or only manually?

    By Sebastian Maciaszczyk October 6, 2020

    A Automatically measure blood pressure and blood oxygen content.

    Reply By Customer Service Center October 8, 2020


Post a new topic

Please note that TOMTOP Forums are a community for all communicating and getting help each other. There will be some enthusiastic friends participate in your discussions. Of course TOMTOP customer service (with tomtop customer service icon) response is guaranteed ,which is the same way you contact us at

open this forum in full page
Customer Reviews

Average Rating:


based on 7 Customer Reviews

  • 5 stars
  • 4 stars
  • 3 stars
  • 2 stars
  • 1 stars

Share your thoughts with other customers and get Tomtop Points, the first 5 reviews get DOUBLE Tomtop Points!

Write a Customer Review
  • By d***1

    November 12, 2020

    everything was fine. The package arrived okay

    Is this helpful? (0) (0)

  • By k***2

    November 5, 2020

    It's a very good quality smart watch. The shipping was very fast. I'm lovin' it!

    Is this helpful? (0) (0)

  • By b***z

    November 2, 2020

    Really good watch with lot of functions like HR, blood pressure, and body temp which i think useful due corona virus but in the other hand two of my packages lost due shipping and for now this is the only product i received but i satisfied with this smartwatch.

    Is this helpful? (0) (0)

  • By b***1

    October 25, 2020

    evriting OK. thanks.

    Is this helpful? (0) (0)

  • By M***o

    October 24, 2020

    very good watch and fast delivery thank you

    Is this helpful? (0) (0)

  • By g***5

    October 22, 2020

    Meets expectations. Price is also good

    Is this helpful? (0) (0)

  • By f***9

    October 20, 2020

    Very good!! Thank you!

    Is this helpful? (0) (0)

Top Sellers More>

Please activate your account first. We will resend the activation email to help you complete your registration.

Recently Viewed


TOMTOP use cookies to give you the best shopping experience. If you continue to use our services or create a new account, we will assume that you agree to our  Privacy Policy.

Tell us which product you want to Social Saving

Click the refresh verification code