Samsung Watch 4 LTE 40mm model, as product releases and specifications may have changed since then. However, I can provide a general overview of features that are commonly found in Samsung smartwatches, and you can check the latest information from official sources for the most accurate details.

Samsung smartwatches typically include features such as:

1. LTE Connectivity: Allows the watch to connect to cellular networks independently, enabling functions like calls and messages without needing a paired smartphone.

2. Tizen OS: Samsung's proprietary operating system for wearables, offering a user-friendly interface and compatibility with various apps.

3. Health and Fitness Tracking: Built-in sensors for tracking heart rate, steps, sleep patterns, and various workout activities. Some models may include ECG and blood pressure monitoring.

4. App Support: Access to a variety of third-party apps through the Galaxy Store, enhancing the functionality and customization options of the smartwatch.

5. Customizable Watch Faces: Users can personalize their watch faces to suit their style and preferences.

6. Water Resistance: Many Samsung watches are designed to be water-resistant, allowing users to wear them while swimming or engaging in water-related activities.

7. Wireless Charging: Convenient charging options, often using wireless charging technology.

8. Bixby Integration: Samsung's virtual assistant for voice commands and smart home control.

9. Large Display: The 40mm size may refer to the diameter of the watch case, and it usually comes with a vibrant, touch-sensitive display.