Allow some time again for the glue to dry. Watch some cat videos on YouTube or some poi lessons on Flowtoys’ web site.
Slide the insert into a soda preform, flick the power switch, select an image with the mode button, screw the cap shut and have at it!
When first switched on, the LEDs will briefly display the (approximate) battery level before the POV effect starts.
Holding down the mode button for longer than 1 second will enable an auto-cycle mode, which will show a different image every 15 seconds.