Have a look at this and follow the instructions for re-synchronising the mouse to the receiver and that the USB port being used is functioning correctly.
If this fails come back with what you found and we'll try again.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?