Keep destructive, burrowing rodents out of your garden & banish unsightly molehills forever. This humane, effective & environmentally friendly device exploits their sensitivity to sound & ground vibration, sending a penetrating sonic 300 Hz through the soil, to move such pests onto new, quieter pastures. Simply push it into the earth & it will work 24 hours a day, for up to 6 months on one set of batteries, & covering a circular area up to 700msquared (7, 500sq.ft.). Requires 4 x 1.5V batteries (not supplied).