SPECIAL WAVELENGTH REPEL MOSQUITO AND MANY OTHER FLYING INSECTS SUCH AS TERMITE, MOTH, BUG EFFECTIVELY. THE SOFT YELLOW LIGHT CUTS OFF THE 'BLUE-LIGHT-HAZARD' SO IS HARMLESS TO EYES AND WOULD NOT DISTURB SLEEP. POWER BY USB. LIGHTWEIGHT. FLEXIBLE BODY CAN BE TWISTED IN ANY DIRECTIONS. SAVE ENERGY.