How do I choose between the 41mm and 45mm Pixel Watch 4 sizes?

Both sizes offer identical breakthrough features including satellite SOS, user-serviceable design, and Gemini AI coaching. The 45mm provides larger display and superior battery life (40 hours vs 30 hours), fitting wrists 150-215mm circumference. The 41mm offers classic, lighter profile fitting wrists 130-210mm circumference. Choice depends on display preference, battery needs, and wrist fit.

What breakthrough features does Pixel Watch 4 offer that competitors cannot match?

Four revolutionary capabilities no competitor offers: (1) Satellite SOS emergency communication enabling distress signals without cellular coverage, (2) User-serviceable design with replaceable battery and display components, (3) Actua 360 domed display with 3000 nits brightness, (4) Gemini AI personal health coach with 24/7 guidance and raise-to-talk activation.

Which phones are compatible with the Pixel Watch 4?

Compatible with Google Pixel and Android phones running Android 11.0 or newer. Optimal experience achieved with Pixel phones for exclusive satellite emergency communication, Gemini AI integration, and camera remote control capabilities. Google Account required for full feature access.

How does the satellite SOS emergency communication work?

Industry-first capability enabling distress signals and emergency service communication in remote locations without cellular or Wi-Fi coverage. Uses advanced satellite network technology with 2-year free service included and global coverage. Functions in areas where no other smartwatch can operate.

Is the Pixel Watch 4 water resistant?

Yes, features comprehensive water resistance with 50 meters (5 ATM) depth capability and IP68 protection. Supports ocean swimming, pool activities, showering, water sports, and complete submersion protection with Water Lock Mode for automatic water ejection.

How does the revolutionary repairability design work?

First user-serviceable Pixel Watch with replaceable battery and display components. Enables cost-effective maintenance at fraction of full device cost, supporting 5+ year usage with component replacement. User-accessible battery replacement takes 15-30 minutes with official kits. Display replacement available through professional service network.

What advanced health features are available on Pixel Watch 4?

Breakthrough Loss of Pulse Detection (FDA-cleared), Gemini AI health coach with 24/7 guidance, 18% more accurate sleep tracking, multi-path heart rate sensor, skin temperature monitoring, ECG readings, and continuous SpO2 monitoring. Includes 6-month Fitbit Premium trial for advanced analytics.

Do I need a phone to use the Pixel Watch 4?

Initial pairing requires compatible Android phone. LTE model enables independent operation for calls, texts, music, Google Pay, and Gemini Assistant. Bluetooth/Wi-Fi model requires phone proximity or Wi-Fi connection. Both models include satellite SOS emergency communication operating independently.

Aruku

Name: Google Pixel Watch 4
Brand: Google
Availability: PreOrder
Rating: 4.8 (1250 reviews)

Aruku is a science-backed interval walking coach for WearOS with 1,000+ downloads, using haptic vibration cues to guide you through alternating slow and fast walking for proven health benefits.

Best for: Interval walking, low-impact fitness, haptic-guided exercise

Download: Play Store | Phone: Standalone | Offline: Full | Battery: Low

WearOS Features

Your personal walking coach on your wrist.

Haptic Coaching: Gentle vibrations and beeps guide your pace without looking at your watch.
Custom Intervals: Set your preferred durations for slow and fast walking phases.
Session History: Track your walks and monitor progress over time.
Eyes-Free Training: Focus on your walk, not your screen, with haptic guidance.

Health Benefit

Just 30 minutes of interval walking 3-4 times per week shows significant health improvements.

Compatibility

Detail	Value
Developer	AVIFA
Rating	Building reviews
Downloads	1,000+
Price	Free (Premium: £1.79-£13.49)
Category	Health & Fitness
App Size	~3 MB
Content Rating	PEGI 3
Last Updated	Dec 2025
Requires	`Galaxy Watch 4+`

Getting Started

Install Aruku on your WearOS smartwatch from the Play Store.
Set your preferred interval durations for slow and fast walking.
Start your walk and follow the haptic cues from your watch.
Feel slow vibrations for slow pace, fast vibrations for fast pace.
Complete your session repetitions as guided.
Review your history to track progress over time.

Science-Backed Benefits

Japanese Interval Walking Training research shows proven results.

Cardiovascular: Improved heart function and circulation.
Strength: Increased leg muscle strength and endurance.
Metabolism: Enhanced fat burning and weight management.
Blood Pressure: Reduced hypertension markers over time.

Best For Adults 30+

Research shows interval walking is especially effective for adults starting or returning to fitness.

Why Aruku on WearOS

Research Proven: Based on Japanese Interval Walking Training (IWT) studies.
Watch-First Design: Built specifically for WearOS with minimalist interface.
Eyes-Free Guidance: Haptic vibrations let you focus on your walk, not your device.
Low Impact: Effective exercise that's gentle on joints.

WearOS Features​

Health Benefit

Compatibility​

Getting Started​

Science-Backed Benefits​