When I searched for that I found this page:
Capture all your moments while playing your favourite sports with the DV660 sports camera and its many accessories.
prixton.com
On that page is a downloadable PDF manual ("Download manual" button).
In that PDF, this is on page 22:
Windows XP/Vista/7/8/10 or higher and Mac 10.8 or higher
Other places in the PDF mention "MSDC mode" which refers to the
Mass Storage Device Class profile of USB devices. This means the camera should identify itself to the computer as a mass storage device (disk) when plugged in via USB.
The manual does mention that you must insert a microSD card, but it doesn't say how it should be formatted. Page 16 says:
Note: The camera is not equipped with built-in memory. Please insert memory card before using. Before using the camera, it is a must to format the memory card on the camera.
All of that is background for the following procedure.
This procedure is intended to discover what file-system format is on the SD card. It's conceivable that the file-system on the camera (and the camera's SD card) is one that your Windows is able to read but a Mac is unable to read by default.
1. Run Disk Utility.app, and choose View all devices.
In Disk Utility on your Mac, change the view setting to display all devices or only volumes.
support.apple.com
2. Select the device representing the camera.
You stated in your first post that this is grayed out. Please try selecting it anyway.
If it's selected, the main part of the Disk Utility window will show some info about the device.
Please make a screenshot of this window and post it in a reply here.
3. If the device representing the camera isn't selectable,
please make and post a screenshot of the left side of the Disk Utility window showing devices.
4. With the camera still connected by USB cable,
open a Terminal window and type:
disktutil list
This will produce multiple lines of output.
Please copy and paste the lines into a reply here.
An alternate procedure uses the System Information app, which resides in /Applications/Utilities.
Launch it and look at the left-hand column of its main window. There should be a hierarchical list starting with "Hardware" and a number of sub-items for each hardware aspect or facet of the computer.
Locate the item named "USB" and click it. In the right-hand panel you should see a summary of the USB busses and devices of the computer. Look thru that list for something that looks like your Prixton device and click it. If you don't see such a device, make a screenshot of that window and post it.
If you clicked on a Prixton device, the lower portion of that pane will show various details of the USB device, including any disk-name identifiers, partition maps, file-system partitions, etc. Please post a screenshot of that pane.
As an example of an SD card my Macs won't read completely, I have microSD cards formatted for use in Raspberry Pi units I have. These have an FDisk partition scheme and a FAT-32 partition, which the Mac recognizes, and a Linux ext4 partition, which it doesn't.
Example output from 'diskutil list'.
Code:
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *31.9 GB disk2
1: Windows_FAT_32 WARP2 268.4 MB disk2s1
2: Linux 2.0 GB disk2s2