The packaging indicates:

• Six plug-in units

• Three operating modes, shown by blue, yellow, and red indicator lights

• Frequency range advertised around 22–65 kHz

• Coverage claim of roughly 800–1,200 square feet per unit

• Intended for mice, mosquitoes, cockroaches, spiders, ants, and other pests

• Chemical-free operation

• Standard U.S. wall-outlet use

• EPA establishment number printed on the box

These devices emit ultrasonic or varying-frequency sound that manufacturers claim makes an area uncomfortable for pests.