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  3. K21 Smartwatch – Specs Review

K21 Smartwatch – Specs Review

K21 Smartwatch – Specs Review
Brand: Other Brands
Category: Smartwatch
  • Processor: RTL8762C
  • Operating System: Proprietary OS
  • Display: 1.3" inch 240 x 240 pixel resolution
  • Memory: : 521KB (Flash 64MB)
  • Battery: 230 mAh battery 30 Days standby time
  • Sensors: g-sensor, heart rate monitoring, blood pressure, blood oxygen monitor, thermometer

K21 Smartwatch – Specs Review


If you are in a hunt for a circular smartwatch with a minimalist design, the K21 smartwatch might be a good pick. The wearable has a circular design, having a zinc alloy body with a rounded edges, there is also a circular button on the side for power/home button. Available in pink, silver, and black color, the K21 smartwatch has a sporty look, clean looking and with a unisex design. It has a sporty interchangeable strap available in silicon strap with stainless steel buckle.


The screen display of K21 smartwatch is a full circular display. It has a full color 1.3” inch IPS LCD screen display with a 240 x 240 pixel resolution. A full touch smartwatch with slim black bezel. According to its specs, the wearable has a 2.5D curved sapphire tempered glass display with crystal clear clarity.

Overall, the wearable is light, and comfortable to use. And with a good IP67 waterproof rating. No worries about wearing it while washing your hands or going for a swimming.


When it comes to sensors, the wearable is fully loaded. The smartwatch is packed with heart rate monitoring, it also has blood pressure monitoring, and blood oxygen monitor. It provides data 24/7 with graphs and stats in the support app. Aside from that, the smartwatch also has a thermometer monitor, providing accurate temperature in real time. There is also a g-sensor for its sports monitoring.

The smartwatch also has a stable connection with its Bluetooth 5.0, it is compatible with the latest Android and iOS operating system. Its battery is 230 mAh that has a standby time of up to 30 days, and 10 days of normal usage. Its Realtek chipset is a low power consumption chipset, and its Bluetooth 5.0 is stable giving it a smooth connection.

Notable Features of K21 Smartwatch

  • Health monitoring function with thermometer
  • Multiple Workout Modes
  • Smart Reminder
  • Clean Minimalist Look
  • Long Standby time




Form Factor

Design Circular


Screen Size 1.3" inch
Display Type IPS LCD
Screen Resolution 240 x 240 pixel resolution
Touch Type Single Point Touch Screen


Size 45 mm x 10.8
Weight 43 grams
Casing ABS


OS Platform Proprietary OS




Internal Storage -
Card Slot none


SIM Slot none
WIFI none
NFC none
Bluetooth Bluetooth 5.0
USB none


Battery Capacity 230 mAh battery 30 Days standby time
Charging Technology Magnetic Charging Cable

Body Resistance

Body Protection IP68 Waterproof
Glass Technology 3D curved Tempered Glass


Sensors/Functions g-sensor, heart rate monitoring, blood pressure, blood oxygen monitor, thermometer


Audio -


Camera Type none


Features Body temperature monitoring, heart rate monitoring, multiple sports mode, sleep monitoring, alarm, call and message notifications, remote camera, sedentary reminder, multiple watch faces,

Color Availability

Colors pink, silver, black

Other Details

Other Details Using F Fit app

Package Contents

Package Contents 1 x K21 Smartwatch
1 x User Manual
1 x Charging Cable


Compatibility iOS 9.0 version and above and Android 5.0 version and above
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