Features: -The device can emit interference in all directions of 360°, leaving mice nowhere to hide. -It has four speakers and can intelligently change frequency, which will not make mice immune. -It uses high-frequency crushing ultrasonic waves, which are harmless to the human body and will not affect pregnant women and babies. -It can not only drive away rats, but also mosquitoes, cockroaches, flies, ants, bats and so on. -Mouse repellent is a continuous process, and it takes patience to use 2-4 cycles. Specification: Colour: black Voltage: 5V Output frequency: 25kHz-65kHz Shell material: ABS Power: 6-8W Size: 106*93.5mm .