ZEUS 3 PRO Smart Fitness Tracker Review – Budget Smartwatch with Calling, SpO2 & 10-Day Battery

1. Where ZEUS 3 PRO Sits in the U.S. Market

If you’re shopping for a smartwatch in the U.S., the market splits pretty clearly:

• Under $80 → Mostly no-brand / OEM Chinese watches. Tons of features, accuracy can be hit or miss.
• $100–$150 → Amazfit, Fitbit Inspire series, higher-tier Xiaomi.
• $250+ → Apple Watch, Samsung Galaxy Watch, Garmin.

ZEUS 3 PRO is firmly in that first category: low price, feature-packed.

Typical price:

• Usually around $67–$72, depending on color.
• Sporty colors like Orange, Green, Red are often slightly cheaper than Black.

At this level, it competes with models like:

• TOZO S3
• Older Amazfit Bip U
• Various “no-brand” watches on Amazon and Walmart

What makes ZEUS 3 PRO stand out on paper is this combo: Bluetooth calling + large screen + 450 mAh battery. That’s a strong spec list for the price.

2. Design & Wear Comfort: Not Cheap-Looking, Not Premium Either

1.39” IPS Display

First impression: it doesn’t look like a $40 toy. It feels closer to a mid-range sporty smartwatch.

• Size: 1.39 inches
• Panel: IPS
• Slightly curved glass
• Full touch control

It’s not AMOLED-level vibrant, but:

• Bright enough indoors
• Still readable under strong sunlight
• Viewing angles are decent

At this price, the screen is “perfectly usable without being annoying” — which is actually a compliment in the budget segment.

Shape & Feel

• Round watch face
• Sporty styling
• Slightly thick because of the big battery

On the wrist:

• Heavier than a fitness band
• Lighter than a metal Galaxy Watch

I wore it for gym sessions, walking, and full workdays — no major discomfort. The rubber strap is soft and handles sweat fairly well.

The Orange version looks very sporty — great for gym and outdoor use. If you dress more business casual, Black or Dark Green blends in better.

3. Bluetooth Calling: The Biggest Selling Point

Let’s be direct: stable Bluetooth calling under $80 is a big deal.

After pairing via Bluetooth 5.1, you can:

• Answer calls
• Make calls from the watch
• See call notifications
• Get message and social app notifications

Real-world experience

Using it with Android:

• Speaker: Fine in a quiet room or office
• On a noisy street, it’s harder to hear
• Mic: Clear enough for short calls

It doesn’t replace Bluetooth earbuds, but it’s very convenient when:

• Your hands are busy
• You’re in the gym
• You’re driving and need to pick up quickly

This feature alone makes ZEUS 3 PRO feel more “premium” than its price suggests.

4. Health Tracking: Useful for Trends, Not Medical Use

ZEUS 3 PRO includes:

• Heart Rate
• SpO2
• Blood Pressure (estimated)
• Sleep tracking

Heart Rate

Compared with a gym HR monitor:

• Sitting still → fairly close
• During intense exercise → noticeable delay

Good for general trends, not deep performance analysis.

SpO2

Readings usually look reasonable, but:

• Not medical-grade
• Sensitive to fit and positioning

Blood Pressure

Let’s be honest: on watches at this price, BP is algorithm-based estimation, not real cuff-style measurement. Don’t use it to diagnose anything.

Sleep Tracking

Surprisingly decent:

• Sleep duration detection is fairly accurate
• Deep vs. light sleep breakdown is “good enough”

If you just want to know:

• How long you slept
• Whether you’re sleeping too late

It does the job.

5. Fitness Features: For Casual Users

Multiple sports modes:

• Running
• Walking
• Cycling
• Other basic activities

Tracks:

• Steps
• Estimated calories
• Workout duration

But it lacks:

• Built-in GPS
• VO2 Max
• Advanced performance metrics

So this is a basic fitness tracker, not a tool for serious athletes.

6. Battery Life (450 mAh): A Major Win

This is one of my favorite parts.

Brand claims:

• 7–10 days typical use
• 45–60 days standby

My real use (HR on, notifications on, occasional calls):
→ About 7–8 days per charge.

Compared to charging an Apple Watch daily, this feels like freedom. Great for travel or people who hate nightly charging.

7. Water Resistance (IP67)

IP67 means:

• Hand washing: fine
• Rain: fine
• Gym sweat: fine

But:

• Not for long swimming sessions
• Avoid hot showers with it

For everyday use, it’s enough.

8. What People Online Are Saying

Across international listings and user reviews, sentiment is mixed but predictable for this category.

Some sellers describe ZEUS 3 PRO with the same core features — 1.39″ display, Bluetooth calling, HR, SpO2, sleep tracking, IP67, and multi-day battery life — aligning with real use.

On marketplaces like Banggood, similar models under the ZEUS/LOKMAT line have received generally high average ratings, with users praising features and battery life for the price. At the same time, some buyers report issues like touchscreen responsiveness and inconsistent after-sales support, which is common with unbranded budget devices.

Translation: good value when it works well — but you accept more risk than with big brands.

9. Comparison with Other Budget Smartwatches

Zeblaze Ares 3 Pro is often highlighted for calling features and battery in the same low-cost category.
Realme’s watch line is known for a more polished user experience and stronger brand support in this segment.

ZEUS 3 PRO wins mainly on price-to-features ratio, not ecosystem or software refinement.

10. Biggest Strengths

1. Bluetooth calling at a very low price
2. Excellent battery life
3. Large, easy-to-read screen
4. Many features in one device
5. Simple to use

11. Main Weaknesses

1. Accuracy can’t match Apple Watch or Garmin
2. Unbranded — long-term software support uncertain
3. Not premium-looking
4. No built-in GPS

12. Who Should Buy ZEUS 3 PRO?

Great for:

• First-time smartwatch users
• Older users wanting HR and step tracking
• Casual gym-goers
• People who want wrist calling
• Anyone who hates charging daily

13. Who Should Skip It?

Not ideal for:

• Serious athletes
• Users needing highly accurate health data
• People who want premium design and brand
• Apple / Samsung ecosystem users

Final Verdict

ZEUS 3 PRO is not a high-end smartwatch. But for its price, it’s:

• Smart enough
• Practical
• Excellent on battery
• Strong value because of Bluetooth calling

Think of it as a practical smartwatch for people who care more about usefulness than brand names. If you understand its limits and don’t expect Apple Watch–level performance, ZEUS 3 PRO is a reasonable budget pick in the U.S. market.