The device is a solid state emitting soundwaves of frequency 400Hz at intervals to repel underground rodents like Moles, Grond Squirrels, Shrews, Voles, Pocket Mice and Gophers.mosquitoes.

Specifications
Power Supply : 4 x 1.5V D cell batteries
Dimension : 410mm (L) x 51mm (dia.)
Weight : 320g
Housing : Aluminium main body
Frequency : 400Hz
Effective Area : approx. 1000 sq. meters
Safety Standards : CE
FOB : Hong Kong
Country of Origin : China