The KOSPET TANK M4 is a rugged premium smartwatch built for users who demand more than just casual fitness tracking. With Inox 360 stainless steel build, 10 ATM & IP69K water resistance, 45 m dive support, dual-band GNSS, and a super-bright 1.96″ AMOLED display, it is designed for divers, outdoor explorers, athletes, and professionals who want reliability, precision, and style in one tough package.
Feature Category
Details
Brand / Model
KOSPET TANK M4
Connectivity
Bluetooth 5.3
Storage / Memory
32 GB ROM, 16 MB SRAM
Body Material
Inox 360 Stainless Steel (SGS Certified), Stainless Steel Case Back
Weight (without strap)
80 g
Dimensions
50.5 × 42.5 × 13 mm
Strap
22 mm Liquid Silicone, Quick Release, Wrist Fit 150–240 mm
Bluetooth Calls, Notifications, Music Storage & Control, Camera Control, Find Phone, Voice Assistant, SOS, Sedentary Reminder, Do Not Disturb, Water Ejection, Screen Lock & Password
Compatibility
Android 7.0+, iOS 14.0+, Apexmove App, Sync with Apple Health & Strava
Languages
37 Supported Languages
Premium Stainless Steel Design Built to Last
The KOSPET TANK M4 stands out instantly with its Inox 360 stainless steel body and stainless steel case back, which give it a durable, premium and tactical look. Unlike plastic or lightweight casual watches, this model is built to handle rough environments, daily wear and intense activity. Weighing 80 g (without strap), it feels solid yet balanced on the wrist.
The liquid silicone strap is gentle on the skin, sweat-resistant and comfortable for long-term wear. With a 22 mm quick-release design and wrist fit between 150–240 mm, you can easily swap straps and personalize the look. The four physical buttons add extra control when your hands are wet, wearing gloves, or underwater where touchscreens are harder to use.
Available in Black and Silver, the TANK M4 matches both rugged outdoor gear and everyday office outfits, making it a versatile choice for all-day use.
Brilliant 1.96″ AMOLED Display with Gorilla Glass Protection
At the heart of the KOSPET TANK M4 is a large 1.96″ AMOLED display with 410 × 502 resolution and 331 PPI, ensuring ultra-sharp icons, crisp text, and deep blacks. The 60 Hz refresh rate gives smoother scrolling and transitions compared to regular budget smartwatches, providing a more premium user experience.
The display reaches up to 1000 nits peak brightness, making it easy to read even under harsh sunlight—ideal for hiking, riding, or working outdoors. Corning® Gorilla® Glass 3 adds strength against everyday scratches and bumps, while features like auto-brightness and raise-to-wake ensure maximum visibility with minimum battery drain.
Extreme Water Resistance and Professional Dive Support
The KOSPET TANK M4 isn’t just “water-resistant”—it’s built for serious water sports:
10 ATM water resistance
IP69K rating for high-pressure and high-temperature water jets
Dive-ready for up to 45 meters
With specialized Freedive, Scuba and Gauge dive modes, this smartwatch becomes a powerful companion for ocean lovers, scuba divers, underwater explorers, and swimmers who need reliable tracking and durability under pressure. You can confidently wear it in the pool, sea, heavy rain, or during intense water-based work.
Long-Lasting 500 mAh Pure Cobalt Battery
Powering all these features is a 500 mAh pure cobalt battery designed for consistent performance and long life. Thanks to optimized power management and efficient hardware, the KOSPET TANK M4 delivers:
14–15 days of typical daily use
9–10 days with heavy use
5–6 days with Always-On Display enabled
21–22 hours of continuous GPS tracking
The magnetic charging dock makes topping up simple and convenient, charging the watch fully in about 2 hours. Whether you’re on a long trip, a camping expedition or a busy work week, you won’t be stuck charging every night.
Advanced Sensors and Dual-Band GNSS for Accurate Tracking
For users who care about precision, the KOSPET TANK M4 brings a full suite of advanced sensors:
VC9213-4PD health sensor for accurate heart rate and SpO₂ readings
6-axis gyroscope for motion and activity tracking
Dual-band GNSS with support for GPS, Galileo, GLONASS, BeiDou, QZSS, NavIC
Geomagnetic sensor for compass features
Barometric altimeter for altitude and climbing data
Ambient light sensor for auto brightness
Temperature sensor for environmental awareness
Dual-band GNSS ensures better accuracy and faster positioning lock, even in challenging environments like dense cities, forests, mountains or near tall buildings. Combined with offline maps and real-time navigation, it transforms your wrist into a mini outdoor computer.
24/7 Health and Wellness Monitoring
More than just a rugged outdoor watch, the KOSPET TANK M4 delivers complete health tracking around the clock:
24/7 heart rate monitoring
Blood oxygen (SpO₂) tracking
Stress and mood monitoring
Sleep tracking with detailed stages, including REM, plus nap tracking and sleep schedule support
Alerts for abnormally high or low heart rate
Alerts for low blood oxygen
Menstrual cycle tracking for women
Breathing exercises to help with relaxation and stress relief
A convenient one-tap measurement allows you to quickly check heart rate, SpO₂, stress and mood in a single interface, giving you a fast health snapshot any time.
Note: The KOSPET TANK M4 does not measure blood pressure, and all health metrics are for wellness and fitness purposes—not for medical diagnosis.
183+ Sports & Training Modes for Serious Athletes
If you are serious about sports, the KOSPET TANK M4 will keep up with your training. It supports:
23 ApexMotion core sports
160 freestyle training modes
From running, cycling, hiking, trekking, swimming, rowing and gym workouts to niche and freestyle activities, you can track almost anything you do.
Running features include:
Distance and average pace
Cadence and speed tracking
Heart rate zones
Real-time navigation support
Swimming features include:
SWOLF score for efficiency
Average pace
Stroke recognition & stroke rate
Lap counting
Daily activity is tracked continuously, including steps, distance and calories, ensuring you always have a clear picture of your movement. Professional tools like personalized training plans and smart recognition help you train more effectively and consistently.
Outdoor Navigation & Tools for Explorers
The KOSPET TANK M4 shines in outdoor conditions thanks to its powerful navigation and toolset:
GPS positioning with offline maps
Real-time navigation and route back functionality
Route import and export for planned adventures
Compass for orientation
Moon phase and tides for coastal activity, camping or fishing
Sunrise and sunset times for planning hikes, photography or outdoor work
Extreme weather alerts so you can stay prepared
These features make this smartwatch ideal for hikers, trail runners, climbers, bikers, off-road riders and anyone who spends serious time in nature.
Smartwatch Features for Everyday Convenience
Beyond sports and outdoor tracking, the KOSPET TANK M4 delivers a full smartwatch experience:
Bluetooth 5.3 calling with built-in speaker and microphone
App, SMS and call notifications at a glance
Music control and onboard storage using the 32 GB ROM
Emergency SOS, sedentary reminder, Do Not Disturb mode
Water ejection to clear the speaker after swimming
Screen lock and password for extra safety
With large storage and stable Bluetooth connectivity, you can carry music on your wrist, manage calls, and control basic phone functions without constantly touching your smartphone.
Compatibility, Apexmove App & Third-Party Sync
The KOSPET TANK M4 works smoothly with:
Android 7.0 and above
iOS 14.0 and above
You manage the smartwatch through the Apexmove App, available on both Google Play and the App Store. Inside the app you can:
View detailed health and workout analytics
Configure notifications and settings
Customize watch faces and layouts
Manage training plans and routes
For fitness data, it supports syncing with Apple Health and Strava, allowing you to integrate the TANK M4 into your existing fitness ecosystem. With 37 supported languages, it’s ready for global users and multi-language environments.
Who Should Buy the KOSPET TANK M4?
The KOSPET TANK M4 is perfect if you:
Want a rugged, metal-built smartwatch for real outdoor use
Need serious water and dive resistance up to 45 m
Prefer long battery life over charging every day
Require accurate GPS and dual-band GNSS for tracking and navigation
Do activities like diving, trekking, hiking, trail running, cycling, open-water swimming, or adventure travel
Want a balance of health tracking, sports performance and smart features in one watch
If you only need a slim fashion watch for basic step counting, this model may be more advanced than you require. But if you want a true performance smartwatch that can handle rough conditions, the TANK M4 is a powerful choice.
Final Verdict: Why You Should Buy the KOSPET TANK M4 from Tech Den
The KOSPET TANK M4 brings together a premium stainless steel body, professional-grade water and dive protection, dual-band GNSS navigation, a vibrant 1.96″ AMOLED display, and long-lasting 500 mAh battery to create a smartwatch that truly stands out in the rugged category. It’s not just another fitness tracker—it’s a serious tool for divers, explorers, athletes and heavy users who demand reliability.
When you buy the KOSPET TANK M4 from Tech Den, you’re not only getting a powerful smartwatch—you’re also getting the confidence of purchasing from a trusted smartwatch specialist that focuses on quality, authentic products and after-sales support. Tech Den understands the needs of real users, from outdoor professionals to everyday enthusiasts, and can guide you with setup, features and usage tips to get the most from your TANK M4.
If you’re looking for a durable, feature-packed, adventure-ready smartwatch with excellent value, the KOSPET TANK M4 from Tech Den is an outstanding choice.
