You can turn on the mouse by pressing the golden button surrounded by a silver rectangle for around 5 seconds.

The LED that indicates the status of the mouse was removed but you can see a red LED light in the sensor lens if the mouse is turned on.

To change DPI, change the LOD and see the battery percentage download Synapse here.

You can update the firmware using this guide

You might need to update the dongle firmware.

Then you can connect the dongle in Synapse after clicking on the Dongle and then "Open Pairing Utility".

For the 8k pairing process, it is important that the mouse and the 1k dongle is not connected by cable!

Regularly charge the mouse using the USB-C cable. Check for the battery percentage in Synpase. Smaller batteries like the 150mAh may show a percentage of for example 60% when they are full.