A Bluetooth headset like the M90 Pro typically includes the following features:

1. Wireless Connectivity: The headset uses Bluetooth technology to connect wirelessly to devices such as smartphones, tablets, or computers.

2. Hands-Free Calling: It often comes equipped with a built-in microphone, allowing users to make and receive calls without holding their phone.

3. Controls: The headset usually has buttons for controlling various functions like answering calls, adjusting volume, and skipping tracks when listening to music.

4. Comfortable Design: Many Bluetooth headsets are designed for comfort during extended use, with features like adjustable headbands and cushioned ear cups.

5. Battery Life: Battery life varies, but Bluetooth headsets typically offer several hours of talk or music playback time. Some models may also have a standby mode to conserve battery when not in use.

6. Noise Cancellation: Some Bluetooth headsets come with noise-canceling technology to reduce background noise during calls or while listening to music.

7. Compatibility: They are often compatible with a wide range of devices, including smartphones, tablets, and computers, that support Bluetooth connectivity.

8. Charging: Bluetooth headsets typically come with a charging cable and a rechargeable battery. Charging times and methods can vary.

9. LED Indicators: The headset may have LED indicators to show battery status, connectivity status, or charging status.

Remember, the specific features can vary depending on the brand and model of the Bluetooth headset you're referring to. If you have more details about the M90 Pro or a specific manufacturer, I could provide a more accurate description.