Key Benefits

• Dual-frequency GPS for ultra-precise navigation.

• Up to 41 hours of battery life in GPS mode.

• Titanium body and sapphire glass durability.

• Zero-lag global mapping with turn-by-turn guidance.

• Sport-specific modes for trail, climb, and ski.

Made for trail running, alpine climbing, ski touring, or any pursuit where endurance meets elevation, the COROS APEX 4 is a high-performance GPS adventure watch built for mountain athletes who want to train hard and go far, fast. Crafted from Grade 5 titanium with sapphire glass and a crystal-clear Memory-In-Pixel display, it’s engineered to perform in extreme conditions — from sun and snow to altitude and impact.

Equipped with dual-frequency satellite tracking, enhanced Vertical GPS algorithms, and a dual-range barometer, the APEX 4 delivers ultra-precise navigation in dense forests, couloirs, and alpine walls. Its next-generation processor provides zero-lag global mapping, displaying detailed topographic and landscape maps with turn-by-turn navigation and named trails.

With up to 41 hours of battery life in Endurance GPS mode (42mm version) and up to 15 days with basic daily use (including sleep, daily stress, and daily HR measurements), the APEX 4 is ready for multi-day missions. Dedicated sport modes for trail running, climbing, and ski touring, alongside advanced training, sleep, and recovery insights, give a full picture of performance.

Lightweight yet exceptionally durable, it’s precision-engineered for endurance athletes who demand accuracy, reliability, and performance in every environment.

COROS is a performance sports technology brand built for athletes who push limits. Inspired by the outdoors and driven by endurance, COROS designs high-grade gear tested in the world’s most extreme conditions. Every product blends advanced engineering with intuitive design to support serious training and exploration. Created by athletes, for athletes—COROS is made to perform when it matters most.

With our Healf Curation Process, we do the work for you. Shop with confidence knowing that every item has been tried, tested, and curated for you.

Learn more about each step—Brand Discovery, Expert Validation, and Community Testing—here.

For full setup instructions, please follow the user manual included with the product.

GENERAL SPECIFICATIONS:

APEX 4 (42MM)

Dimensions: 42.6 x 42.6 x 15.8 mm
Body Weight: 38g
Weight with Silicone Band: 56g
Weight with Nylon Band: 45g

Battery:
Endurance GPS Mode: 41 hours
High GPS Mode: 34 hours
Max GPS Mode: 26 hours
Daily Use: 15 days (with Sleep, Daily Stress, and Daily HR Measurements)
Charging Time: About 1.5 hours (15℃ ~ 45℃ / 59°F to 113°F)

Band:
Width: 22mm
Wrist Size Compatibility: Silicone: 135–205 mm / Nylon: 135–205 mm
Connection: Quick Release

Display:
Screen Size: 1.2 inches
Resolution: 240 x 240 pixels
Screen Type: 3rd Generation Memory-in-Pixel Touch Screen

Navigation:
Map Type: Landscape Maps (with street and trail names, POIs)
Topo Maps

Other Features:
Back-to-Start
Waypoints
Turn-by-Turn
Pins

Hardware Controls:
Buttons
Digital Dial
Back Button
Action Key

Touch Screen:
Click to select and swipe to navigate

Packaging:
Material: Biodegradable and Recyclable

Data Connection:
Sync data via Bluetooth to the COROS app or directly to the COROS server via Wi-Fi

Music:
Connect to headphones via Bluetooth for music playback with 32GB of built-in storage

Satellites:
Supported Systems: GPS, GLONASS, GALILEO, BeiDou, QZSS
Dual Frequency: Supports L1 + L5

Durability:
Waterproof Rating: 5 ATM
Operating Temperature: -20℃ ~ 50°C (–4°F to 122°F)
Storage Temperature: -20℃ ~ 60°C (–4°F to 140°F)
Charging Temperature: 0℃ ~ 45℃ (32°F to 113°F)

Material:
Screen: Sapphire Glass
Bezel and Backing: Titanium Bezel and High-Strength Polymer Backing
Band Material: Nylon/Silicone