There are no drivers that are specific to the BTM440. Like other Bluetooth earpieces, it is supported by the generic HFP drivers for your computer's Bluetooth adapter, which provide hands-free audio.
Unfortunately, these drivers can not be installed through Windows Update, and having Windows completely up-to-date will not ensure that the required drivers are present. Locating the correct drivers will depend on the type of adapter you are using:
• If you are using an external USB Bluetooth adapter, the drivers
should be available at the website of the company that manufactured the adapter.
• If your computer has built-in Bluetooth, the drivers should be
available on the support page for the model that matches your computer.