Apple Watch Series 7 GPS 45mm: 
- GPS
- Compass
- Always-on altimeter
- Water resistant 50 metres
- Blood oxygen sensor (Blood Oxygen app)
- Electrical heart sensor (ECG app)
- Third-generation optical heart sensor
- International Emergency Calling
- Emergency SOS
- Accelerometer up to 32 g-forces with Fall Detection
- Gyroscope
- Ambient light sensor
- Speaker 50 percent louder
- Microphone (enables Noise app)
- Apple Pay
- GymKit
- Capacity 32GB