Apple Watch SE GPS 40mm Gold Aluminum Case With Starlight Sport Band - MKQ03

Design
Retina display is over 30 percent larger than Series 3, so you can see more information at a glance

Performance
S5 System in Package is up to two times faster than Apple Watch Series 3, so apps are faster and launch quicker
Speaker is 50 percent louder than Apple Watch Series 3, so calls, using Siri, and other voice interactions are even better
All-day battery life, up to 18 hours

Compass and always-on altimeter
The built-in compass shows your direction, incline, latitude, and longitude, even without a Wi-Fi or cellular connection
See your real-time elevation change foot by foot with the always-on altimeter and still enjoy all-day battery life
See your direction, location, and elevation change at a glance with watch face complications

Heart health
Apple Watch can check your heart rhythm in the background and alert you to an irregular rhythm that appears to be atrial fibrillation (AFib)
With the optical heart sensor, you can check your heart rate at any time in the Heart Rate app—and see your resting, walking, and workout recovery heart rates
Heart rate notifications tell you if your heart rate is above or below a certain number of beats per minute

Swim proof
Swim proof with a water resistance 50-meter rating, so you can take Apple Watch SE to the pool, ocean, and shower

Workouts
With watchOS 8, Apple Watch SE can detect when you’re riding a bike and remind you to start a workout—and can automatically pause and resume when you stop temporarily
The Outdoor Cycling workout algorithm more accurately calculates calories when you’re riding a pedal-assisted e-bike
Use Voice Feedback to hear metrics like pace, speed, progress toward Activity rings and goals, and more
Fall detection is optimized for workouts (coming later this year) and can detect a hard fall, initiate a call to emergency services, and alert your emergency contacts