This little plastic glitter lamp runs on battery power and is shake/time activated. Give it a shake and the LED lights start to run until the inbuilt timer times out - at abot 5 minutes.
The lamp comes with batteries pre-installed and these are sufficient to power the inbuilt LEDS for a goodly duration (depending on useage). There's no on/off switch or any other means of control - simply a screwdriver-closing lock on the battery door.
Considering the small size of the lamp, the light emitted is surprisingly bright. The colour changes are effective, and the glitter is both pretty during the daytime and provides interesting contrast/shadow during nighttime/evening use - creating a faint but pretty starry-sky type effect in its projection onto walls/ceilings (for small rooms/close proximity).