K52 Square Bluetooth Calling Smartwatch, 1.39″ IPS, 400mAh Battery – Black

The K52 is a square-face smartwatch with Bluetooth calling, a sharp 1.39-inch 360 x 360 IPS screen and a large 400 mAh battery that gives 5–10 days of use. It adds all-day heart rate, SpO2 and weather on your wrist.

Best for: taking calls hands-free from your wrist; men who want a bolder, everyday smartwatch.

Key features of the K52

• Bluetooth 5.0 calling from your wrist
• Square 1.39-inch IPS screen at 360 x 360
• 400 mAh battery: about 5–10 days use, 30 days standby
• All-day heart rate, SpO2 and blood pressure wellness estimates
• Weather display and vibration alerts
• 128 MB flash for watch faces

K52 specifications

Compatibility and setup

The K52 pairs with Android 4.4+ / iOS 8.0+ smartphones over Bluetooth using its free companion app. Install the app, switch on Bluetooth and pair the watch from inside the app (not from your phone’s Bluetooth menu) so notifications, time and health data sync correctly. Not sure if it will work with your phone? Read our smartwatch compatibility guide.

K52 FAQs

Can the K52 make and receive phone calls?

Yes. The K52 supports Bluetooth calling: once paired with your phone you can answer, reject and make calls from the watch using its built-in microphone and speaker. Keep your phone within Bluetooth range, around 10 metres.

Is the K52 waterproof?

The manufacturer does not list an IP water-resistance rating, so treat it as splash-safe only and take it off before washing up, showering or swimming.

How long does the battery last?

Expect around 5–10 days of typical use from its 400 mAh battery. Bright screens, always-on display, frequent calls and continuous heart rate tracking use more power. See our smartwatch battery life guide for tips.

Does the K52 work with iPhone and Android?

Yes, it is compatible with Android 4.4+ / iOS 8.0+ phones via the companion app.

Are the health readings medically accurate?

No smartwatch in this range is a medical device. Heart rate, blood oxygen, blood pressure, temperature and similar readings are estimates to help you spot trends in your general fitness and wellbeing. They are not suitable for diagnosing or managing a medical condition, so always speak to a healthcare professional about health concerns.

Delivery and returns

Sent by tracked UK delivery with hassle-free 30-day returns and friendly UK customer support. See delivery and shipping and our returns policy for details.

Explore more

Compare similar watches in Bluetooth Calling Smartwatches, Smartwatches for Men, all smartwatches, or read the Smartwatch Battery Life Guide and our smartwatch buying guide to choose the right model.